(And other single-winner preferential voting systems)
For more information about this faq, please contact jquinn+VOTE@cs.oberlin.edu
FAQ Revised: Tuesday 19 August 2003 20:12:31
The current system fails to be majority rules because it's throwing away votes! When a third-party candidate (a Perot or a Nader) enters the race, there's a lot of argument about whether voting for them is "throwing away your vote". In reality, it's not the voters who throw away those votes, but the system. Preferential Voting is a way of making sure that every person can have a vote in the decisive contest between the final two strongest candidates.
Preferential voting would give the little guys a better chance because you can vote based on the message, not who's winning the crooked horse-race. And if a few of the little guys who won were from little parties, they wouldn't owe any loyalty to the party hacks who would start shooting them in the back as soon as they stood up for real campaign-finance reform.
So if they're just blatantly lying, don't get caught up in a technical argument about why; just point out who they are and why they're lying - "You're a professional lobbyist, you're afraid this will put you out of work, and you're not even trying to convince people rationally to vote no, you're just trying to scare and confuse them!".
For instance, in the campaign against measure A, the opposition sent out fliers claiming that "your right to vote is in danger... [from a system that] has no track record". They draped these blatant lies in rousing images of democratic crusaders. Fliers to Chinese-Americans had pictures of Tienanmen Square and the ones to women had pictures of sufragettes and NOW rallies (even though both NOW and the League of Women Voters both endorsed measure A). In a Republican town, they would have probably used a picture of George Washington saying "No taxation withoute Representation." ... even though measure A saved money.
But as long as you can keep from getting more technical than your opponent, here are the more specific rebuttals for their arguments:
Counting the votes is also a clear, straightforward process (whichever system you choose VOTE-123 or IRV) that can be done as easily by computer as the current system. If you have to fall back on a hand recount, that is also clearly feasible.
Sure, I make things complicated when I try to answer any question anyone could ask. So just read the answers you care about.
It's true, the fastest way to count PV is electronically. It's also the fastest way to count regular elections, and many places already use electronic vote-counting machines. (As we saw in Florida 2000, there's problems and potential frauds with mechanical and hand counts too!) But as long as you keep a paper trail of ballots and you can check the results, the courts have the power to overthrow or punish any fraud. Especially with VOTE-123 (a particular kind of PV, explained below), there are even fewer possible kinds of fraud and just as many chances to hand-check the machine results as with the current system.
...shoot, I fell for the trick. If your opponent says "But that's not one man one vote", the right answer is just "That's a lie. Yes it is."
But more importantly, improving our democracy is the American ideal. In the 18th century, Alexis de Tocqueville said in Democracy in America: "Democracy is like a rising tide; it only ebbs to flood back with greater force, and soon one sees that for all its fluctuation it is always gaining ground." And he was right. Year by year, decade by decade, we've won rights for the landless, for African-Americans, for women, for 18-year-olds; and other democratic rights such as the right to directly elect our senators, citizen initiatives in many states, term limits, campaign finance limits, public access to the airwaves, better voter registration, recall elections, etc. Every 30 or 40 years there's a major advance, and even with the backlashes that sometimes come in between we've still made steady progress. It's been about 35 years since the last major advance - the 1968 Civil Rights act - so it's time for the tide to rise again.
This reform doesn't fix all of that, or even most of it. But it lets us out of the straitjacket we're in so we can start to deal with those problems. And, just as important, it's an issue where people can get together and organize across "party lines" and without needing politicians to lead us, which is the healthiest thing we can do for our democracy.
But seriously. If you really can only handle making one vote, you'd still be able to do that. Your vote would still count just as long as your favorite had a chance - just the way it does now. Just because you like to limit your options, is no reason to limit everyone else's.
One group of supporters that it would be fatal to discount are the officeholders. It feels good to pass sensible legislation that makes your constituents happy. Most incumbents are glad to see the logic of this reform, if they get a strong message from their constituents; only a few are so wedded to the current corrupt system that they truly oppose this.
Third, there would be the party hacks for the two major parties. Most everyday Republicans and Democrats alike would love the better democracy that PV would bring, but there are two kinds who wouldn't. There the zealots who have confused their ends (passing legislation they like in order to make this a better country) with their means (electing "more Democrats" or "more Republicans", not just "better people"). And there are a minority of career politicians who actually like the high-rolling, corrupt campaigns of today, who don't want real democracy keeping them honest. Luckily, most politicians would rather win a fair election. Even the ones who sell out a little to win would rather not have to.
Preliminary numbers from the Department of Ethics Forms 460: "No on A", a small committee formed by some people honestly suspicious of that the SF department of elections couldn't handle IRV, had a total budget of about $500.
"San Franciscans for Voter Rights", an anti-IRV PAC formed by a big-time downtown lobbyist, declared in the last 16 days before the election to try to get around reporting requirements, sent out lying hit pieces using about $77,000. This originally came entirely from downtown businesses, most of it came funnelled through big PACs (such as $61,000 from the "committee on JOBS") which have a long term reputation for backing corporate-written bills (for instance, insurance industry bills, etc.).
If you add up the other contributions of those same large PACs to various "voter guide" organizations (the "so-and-so Democratic club", etc.) which all conveniently had a "No on A" stance, there are over $100,000 EXTRA (in addition to the amounts above). There were obviously other issues on the ballot, but given the way many of these "voter guides" highlighted their measure A "NO" with bold face, I think that it's fair to count at least 10% of this as anti-A money; so count this as another $10,000
Add in 1/2 of the $32,000 staff expenses, January-March, for "San Francisco Chamber of Commerce 21st Century Fund", which although it is supposed to be a "general" lobbying organization took up no other issues in this race: another $16,000
Total anti-A money: over $100,000
For balance, the pro-a money:
"Fair Vote SF", a pro-A group, got $87,000 from small contributions from individuals, most (about $55,000) of it funneled through national or state PACs that see voting reform as important (primarily Center for Voting and Democracy).
Using the same analysis as above (what else did the pro-A PACs do with their money?) there is no extra money to report. Obviously there were pro-A "voter guides", but these voter guides did not get money from clearly pro-A PAC's. Not surprising: generally, the forces of good have simpler accounting practices than the forces of evil. (For full disclosure - the CVD did give $2,713 to "Matt Gonzalez for Supervisor")
Total pro-A money: $87,000
Remember, if your friends and coworkers hear about this from politicians or the media, they will justifiably be suspicious. It almost sounds too good to be true. But if they hear about it from you, they'll be much more willing to believe how good it really is.
Anyway even if you had PR, you'd still need VOTE-123 or IRV for single-winner races. And with luckily, with both VOTE-123 and IRV, there are NO REAL DISADVANTAGES compared to the current system, so I don't have to lie about anything.
Almost always, one candidate will win all of their matches, and win the tournament. For instance, if one candidate is the favorite for a majority of voters, they will obviously win all their matches easily. Sometimes, there will be a tie, where no candidate wins all the matches, and there are simple tiebreakers.
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Now you can clearly see, between any pair of candidates, which one is truly favored by more voters. And so the correct winner is obvious. (Disclaimer: these numbers are just guesses and do not express the views of the author) |
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There are different versions of VOTE-123 which resolve such ties in different ways. Condorcet (who invented VOTE-123) proposed a simple tiebreaker: whoever loses by the smallest margin, wins. (This is the tiebreaker I describe in my 50-word description of VOTE-123, above, when I say "whoever comes closest to beating everyone else wins". A slight improvement on that tiebreaker is Tideman's "Ranked Pairs" (RP) tiebreaker, defined in the glossary. The two work out the same in the case of circular ties of only 3 candidates. (Circular ties with more than 3 candidates are so massively unlikely in the real world of politics that I'll ignore them.)
Of course, you can also get the old-fashioned kind of two way tie under VOTE-123, and you resolve that just as you do it today - probably by drawing lots.
Under IRV (after all the piddly also-rans were weeded out) Perot would be last place and would be eliminated. Then, the Perot voters would decide the election. Say a solid majority of Perot's voters - 16 of the 25% - put Bush Sr. as their second choice, so Bush has his 35% + 16% from Perot = 51%, and Bush wins it.
How does VOTE-123 decide this? In the Perot/Bush race, Perot is preferred by most of the Clinton voters (say, 35 of the 40%) so he gets his 25% + that 35% = 60% and wins it. And in the Perot/Clinton race, Perot again gets (say) his 25% + 30% from Bush voters = 55% for a win. So since Perot can beat both Clinton and Bush Sr in head-to-head races, he wins the "Virtual One-on-one Tournament" and wins the election. Who wins the Bush/Clinton race - which under IRV was the final, decisive runoff - doesn't end up mattering.
(Note: this page is nonpartisan and nothing here is intended to be a comment on the actual politics of any real candidates, examples are illustrations only, and all numbers are made up.)
VOTE-123 is right if the voters have made a thoughtful decision. If the voters on either side really prefer a compromise over the other extreme, then that's what they should get.
IRV is right if the compromise candidate has not been well-scrutinized by the voters. A candidate should win for what they are, not for what they aren't. If voters mark their second choice only because that person "couldn't possibly be worse" than the "real opponent", that person should not win.
For instance, if under IRV Nader had made a much stronger run, and threatened to actually pass Gore without catching up to Bush, those Nader supporters might still have had choose between voting their hopes (Nader) or their fears (Gore, because if Gore is eliminated the centrist Gore votes would go over to Bush and Bush would win.) (Note: It's fine for Bush to win, if he actually has majority support. This isn't about Republicans, Democrats, and Greens, but about real majority-rules democracy. A truly democratic system wouldn't scare people into voting dishonestly.
Current
System (Biggest Minority Rules):
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This picture represents the current situation. New parties start out with such an uphill battle against the "lesser of two evils" phenomenon that they can never get beyond square 1. The fix is in, the game's not worth watching. |
IRV:
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This picture represents the situation under IRV. Parties can get a fair start, but they have a tough hump to get over from about 25% (where they pass the centrist party on their side) to the 50% line (where they beat out both of the centrist parties). Within that zone, they still have to deal with all the old-fashioned bickering with people who should be their allies. Still, they have room to develop their offense and a good pass (a single strong campaign) could put them into winnable territory. |
VOTE-123:
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This picture represents the situation under VOTE-123. A fair playing field for new and old parties alike. |
This extra advantage for the main parties may not seem like much. But if the goal is to keep the candidates honest, any unfair advantage just gives them that much more
room for corruption.
In order to stop such myths, you need to be able to make clear, categorical statements. If you get some talking head on TV saying "you should always vote your true preferences - unless the situation satisfies the Pareto conditions for Condorcet-unfairness as detailed in my paper on toroidal instabilities in assymmetric voting blah blah blah," you're lost. Under VOTE-123, there is no dishonest strategy that isn't dangerous. (Even if that doesn't discourage you, the payoff is small, and the difficulty and public relations danger inherent in planning and organizing strategies is huge). It's impossible to predict whether your strategically dishonest vote will backfire and end up helping someone you despise. The math professor on TV can say it, the 2nd grade teacher can say it to their class, and everyone can understand it. And if anyone comes around saying "A vote for [Nader] is a vote for [Bush]", they'll get laughed off stage or (if they say it in a paid ad) prosecuted for false advertising.
Under IRV, you have to add up the first-round totals from all the precincts before you decide who gets eliminated. Then you have to recount all the ballots for the eliminated candidate, add it all up, and decide who is eliminated again. Either you ship all the votes to a central location, or you need several rounds of counting and communication between the center and the precincts. Either way, there is more opportunity for fraud, it can slow things down, and it makes a hand-recount (or random spot-checks on the validity of the computer-counted result) more difficult.
| Blocs of voters: |
"Rural She-Males": 25% |
"Basketball Uncles": 30% |
"Young and/or Restless": 35% |
"Dupes": 10% |
| First choice: |
Chris |
Alejandro |
Beth |
Doofus |
| Second Choice: |
Alejandro |
Beth |
Chris |
|
| Third Choice: |
Doofus |
Doofus |
Doofus |
|
| Blank (last choice): |
Beth |
Alejandro |
Alejandro |
Alejandro, Beth, Chris |
Who wins? Lets get Doofus out of the way first. Nobody but the 10% of Dupes really like him, but against Alejandro, for instance, he gets 25% from the "Rural She-Males" voting bloc (who dislike Alejandro more). Still, with only 35%, he loses. In similar ways, Doofus loses against Beth and Chris.
But look at Alejandro vs. Beth. The "Basketball Uncles" and the "Rural She-Males" both have a slight preference for Alejandro over Beth, so Alejandro wins with broader support (55%). But notice that Beth actually has deeper support, because the 35% of "Young/Restless" love her and hate Alejandro. And the same kind of thing happens with Beth/Chris (Beth wins with 65% support, but the 25% "Rural She-Males" are especially unhappy with that) and with Chris/Alejandro (Chris's 60% of mild supporters win, even though he's hated by Alejandro's bloc of 30% "Basketball Uncles").
So A beats B beats C beats A, there's no clear winner. This is called a "Condorcet tie" and the candidates involved (everyone but Doofus) are called the "Condorcet set". Broad support balances against deep support; with three strong candidates, nobody has enough of both to win. The Condorcet tiebreaker says that whoever lost by the slimmest margin wins; that's Beth, who lost to Alejandro by only 55 to 35.
How would IRV have handled this? It would eliminate first Doofus, then Chris, leaving the final race between Alejandro and Beth. As we saw, Alejandro can beat Beth head-to-head so Alejandro would win. IRV papered over this weird tie situation by ignoring the fact that Alejandro would lose to Chris. But whether you ignore it or not, this situation is a real paradox. (If this were a soap opera, and IRV were being used, on the night of voting day, when she realizes how the votes are going, Beth would commit suicide. She'd be eliminated, her votes would swing to Chris, and Chris would beat her nemesis Alejandro. The loser dropping out would, paradoxically, give her voters more power and change who won! And here's another paradox: if you held an election for "most hated candidate", IRV would always pick the same winner among )
How would the current system of Biggest Minority Rules handle this? Well, if everyone voted honestly, Beth would win with 35%. But if one candidate had an advantage or disadvantage - something that most voters see as irrelevant to their own views but think other people might notice; advantages like a flashier, more expensive campaign or a more established party, or disadvantages like coming from a minority group - that could change the results. For instance, with enough money, Alejandro might be able to convince the Rural She-Males that "A vote for Chris is a vote for Beth", and win enough of them to take the election.
Reality check: this whole three-way-tie scenario is pretty implausible.
It's based on the fact that candidate B appeals to A's voters but A doesn't
appeal to B's voters. In the real world, two candidates will always appeal
more-or-less equally to each others voters. If A and B are similar enough
for a strong majority A voters to pick B second, then something like the
same number of B voters will probably want to pick A second, too. With a
reasonable amount of that kind of symmetry, VOTE-123 won't tie (unless the situation
is so close that you'd need a recount no matter which system you used).
Since the electoral system is already complicated two-round election, with voters electing electors who elect the president, things would not be simple. A state could proportionally allocate its electors to the top two vote-getters. Within the electoral college, if no candidate has a majority, there are actually many rounds of quasi-runoff voting. Electors could be bound by oath to treat that "non-instant runoff" as if it were instant runoff, with each elector standing for a given order of preferences and bound to change to the next preference if and only if the prior preference comes in last. Theoretically, they could break those vows, but the current system of choosing people who really belong to the appropriate party and fining oathbreakers a couple of thousand dollars seems to work 99.9% of the time.
In fact, with this last refinement, PV would have extra benefits for the voters in whatever state adopted it first. Your state wouldn't be one big chunk, so it would never be "safe" for any candidate to ignore.
So actually, the very complications that make the electoral college such a hassle the way it is, just make it easier and more beneficial to adopt PV!
To count, each counter has a table of n x n cells, where N is the number of possibly winning candidates (as noted above, N is down below 10 within hours of the election). For 5 candidates, you can make a 5 by 5 table with room for tallies in each cell and 5 dangling strips that fold over to cover each row. A tally in column X row Y means a vote for X over Y; if there are more tallies there than in column Y row X, then X is beating Y. To sum up the tallies for two piles, just add the tallies in each cell. To tally one ballot, check the first preference on the ballot - say, C. Mark a tally for each cell down column C, and then fold the strip across row C. Now check the next preference, mark a tally in each uncovered cell down that column, and cover that row. Continue until there are no preferences left on the ballot. Obviously, in a real election, you wouldn't have dangling strips of paper, you'd a cheap plastic gizmo to put your tally paper into, and you'd press a button at the bottom or top of a given column to cover the corresponding row and then swipe a slider to reset it for the next ballot. Yes, it's 2 or 3 times slower than counting a plurality vote, but it's 10 times more democratic.
The problem is that you have to have all the ballots in one place. You can transmit them physically or electronically, but you need every individual ballot. However you transmit them, it's an opportunity for fraud or incompetence.
If you don't have the ballots in one place, you can do the first count, transmit the results to a central location, wait until everyone else finishes and the results are all in, recieve the word of who to eliminate, recount those ballots, retransmit the results, wait again... It's a lot of chatter back and forth, and a lot of waiting for the slowest counter, not just once, but several times.
For VOTE-123, the answer is a qualified yes. VOTE-123 allows heterogeneous systems for vote counting, and you just add up the results. Thus, those counties which can perform the simple task of updating their technology could use it, those counties which cannot would just have to do a hand count.
IRV would start out the same way, with 7 teams on the court. Every 5 minutes you'd kick one team off the court, whichever one had scored the fewest points. When you got down to 2 teams, you'd finish out a normal game. So overall, the last part would be fair. But during the first part a good team with lots of "assists" could get kicked off just for lack of baskets. So you'd end up fighting almost more against your "allies" (the other teams going the same direction) than your opponents.
VOTE-123 is a round-robin tournament. Each team plays each team, one-on-one, fair and square. But because of the magic of Preferential Voting, you could run all the games at once "instantly", so the teams don't get tired out.
This is especially important on certain voting equipment. For instance, on ballots designed for the Optech Eagle (one modern vote-scanning machine), there's only room to mark first, second, and third choices. Under IRV, that means voting for only three people. Under VOTE-123, you can mark a few people at each level. For example, you might mark one person as your favorite, four candidates tied for your second choice, and two candidates for your third choice. It's almost certain that your vote would count, that one of those 7 choices would be among the top two candidates. [Note: I am not 100% sure that the Optech Eagle will allow this. From the ballot design it looks as though it should be possible but I am looking into the technical specifications further.]
This also means that under VOTE-123, no ballots will be counted out as invalid just for double-markings. It's one less rule that a semi-literate voter can mistakenly break. Remember all those double-punched ballots in Florida 2000? Wouldn't be nice if that were never a problem?
(To count the ballots with tied votes would be easy. Remember that VOTE-123 works like a Virtual One-on-one Tournament, with two-way contests between each pair of candidates. On the contests between two candidates that you marked as tied with each other, you don't care which one of those two wins, so your vote wouldn't be counted. Your vote would still count in the races you cared about, where one of the tied candidates was facing someone you ranked as better or worse than them.)
Strategic voting only works under VOTE-123 if, either before or after the strategic changing of votes, there is a "Condorcet tie" - what I've been calling a three-way tie. This situation is very rare - as I said, it involves nearly-balanced voting blocs which not only disagree about which candidate is better, but also about which candidates are similar to each other. Most especially, it is very, very hard to predict accurately using polls. Most people will never make the effort to reliably tell pollsters who their second choice will be, and in such a closely-balanced situation the tiniest polling error could throw off the poll's results. And if you switch around your vote based on a poll that's wrong, you're more likely to end up hurting than helping yourself - especially since your plans will probably leak out and people can plan a counterstrategy.
So, you can still say it categorically: under VOTE-123, there is never a good reason to vote strategically.
The most strategy-proof (for the voters) tiebreaker, and the one I personally would choose if I were the oxymoronic Democracy Dictator, is to draw lots among the Smith set (the ones tied to win). But then, a party could run a number of identical candidates, and, since we're dreaming, voters would be patient enough to rank all those clones, and all the clones would get into the tie, and then that party would have a better chance of winning. So to prevent this hypothetical, read the fine print:
If there is a strict subset E of the Smith set such that all members of E are "equivalent", that is, some member of E beats all the candidates that any member of E beats, then first (recursively) choose a winner from E and eliminate all the other members of E. For instance, if there are 4 members of the smith set, there will always be a two-member E (all 4-point digraphs which contain a spanning cycle are isomorphic), and so you'll be able to reduce the Smith set to two people. (There trivially cannot be two different maximal overlapping E's; handle all nonoverlapping ones simultaneously).
There are other possible tiebreakers, and any one of them has its logic. That's part of why I like the random tiebreaker. I feel you could really argue that any one of the Condorcet winners is the "right" answer, so drawing at random is not a bad choice. However, randomness doesn't sit well with the American populace (even though it is often the official tiebreaker in the current system), so I'll agree with RP as the consensus choice.
Incomplete explanation of my proof:
Statement 1: No effective strategy exists where there is a single Condorcet winner both before and after strategizing.
Proof: If A is the Condorcet winner before strategizing and B is the Condorcet winner after strategizing, then A must have lost votes and/or B gained them in the A/B race. But if the strategizer prefers B to A, they would have already voted B over A, so no change would help this happen.
Statement 2: Thus, the only three possible kinds of strategy are 1. to change the result of a tie; 2. to cause a tie; or 3. to break a tie
Statement 3: Given a lot-drawing tiebreaker: In each of the above 3 cases, a strategic voter whose honest preferences are fully-ordered (ie, no two candidates rank equal in their own preferences) stands a chance of getting a WORSE result than they would have if they voted honestly.
Case 1: Because of our choice of tiebreaker, the results within a tie are random, so no strategy can work here.
Case 2: To cause a tie, you must cause at least one candidate Z to beat the honest winner A. If the strategic voter already preferred Z to A there is no strategy that will do this any more than an honest vote. So the set of possible strategic winners (A, B,...(0 or more extras here), Z) includes at least one possible random result (Z) which the strategic voter sees as worse than A.
Case 3: To break a tie, you must cause the new strategic winner A to beat their honest nemesis Z. But if the strategic voter had already liked A better than Z, then they would already have voted that, and no strategy helps. So the strategic winner A is worse than at least one of the possible nonstrategic winners Z.
Note that this does not contradict Gibbard-Satterthwaite ONLY because our assumption of fully-ordered honest choices may be untrue. It is possible that the strategic voters actually saw A and Z equally good/bad, or at least see some candidate B's superiority as more important than the A/Z distinction. But even in that case, in a three-way tie (the only kind likely in a thousand years) you have someone going to all the trouble of organizing a strategic bloc (with, given a free press, near-certain discovery of their plans and even counterstrategies possible) all for just a 1/3 chance of improving their outcome.
I think it unlikely that the electorate will accept a random tiebreaker (even though in most states they already accept one without knowing it). But the whole Condorcet tie situation is so finicky. For the purposes of making it impossible to plan a strategy, almost any tiebreaker is unpredictable enough to be essentially as good as random. (Good tiebreakers in genereal tend to make strategy impossible in one, but not both, of Case 2 and Case 3. For instance, RP makes case 2 strategies ineffective, and, if my calculations are correct, provides a safe counterstrategy for Case 1 strategies, but allows Case 3 strategies. But don't take my word for it, if you've even read this far it's worth working it out for yourself).
If everyone votes honestly, IRV tends to go somewhat more for the extremes, whereas VOTE-123 goes for a compromise. But this has a contradictory effect! There are some situations where human nature leads most people to prefer compromise, where as in others most of us will not want a compromise. So people may end up using strategy to try to make one system function like the other. Because of strategy, the final results of either system may be backwards from what you'd expect.
In the case of IRV, when there's a good compromise available, people may be scared into switching their first preference. This is analogous to the current "lesser of two evils situation. In the case of VOTE-123, when people on either side see the compromise option as only slightly better than the other extreme, they may vote their honest first choice, but strategically refuse to give their second choice compromise option (*). By cutting out the middle, they would be taking a gamble that their side might win.
These strategies, on the face of them, might not seem so horrible. Instead of being held hostage to strategy as under Biggest Minority Rules, voters are voluntarily choosing strategy to express their meta-preferences (whether they prefer compromise or steadfastness). But strategy introduces another set of problems. If people vote dishonestly because of some strategy, the parties that would have won those honest votes lose some of the "media clout" they deserve. Remember, politics is not just about power, but also about voice. The most admirable movements and parties are not focused towards to taking power, but towards communicating a message - in giving power to the truth - and elections should serve that goal. Therefore, strategy is always an overcorrection. It may elect the right person in the short term, but in the long term it will distort the debate.
Thus IRV's strategies will tend to cut the extremes out of the debate, whereas VOTE-123 will tend to cut out the middle. (Note that in this context, "extreme" is not the same as "strident". You can be thoughtful, or foolishly overconfident, no matter where you are on the political spectra). My view is that more of the creativity comes from the extremes, so VOTE-123 is better.
(*)NOTE: Actually, strategy should be practically nonexistent under VOTE-123. The only reason I include this answer, even though it may seem to undercut my other points, is that I think that it's funny. Two big systems, one pushing for compromise, and one pushing for steadfastness; but if pesky little humans push back, the results are actually backwards from what you'd expect. It's a good parable for the dangers of big government in general, and to share the joke, I had to ignore the asymmetries for one answer.
The whole opposition to PR was based on lies, though. It's true that, because it works by electing a whole legislative body at once, PR will give a fair representation to minority parties like Communists. (These candidates could not have won for IRV or VOTE-123, where it takes a majority to win because there is only one winner at a time). But there was no danger that the Communists would take over; a majority of Americans oppose communism, and so a democratic system like PR would not have put Communists in charge unless that changed. The right answer was not to shut the Communists out to breed in the darkness, but to shine the light of democracy on them. Under such a light, the voters would have seen how they used the small, proportional power they were granted. They would have had to actually improve the lives of the workers, as they claimed to. If they just advanced the interests of the Soviet empire, as their opponents claimed they were doing, they would simply lose votes.
Power corrupts, democracy and open debate prevent corruption. Preferential Voting improves democracy, which is the best recipe for avoiding a loony in charge.
It works like this: First, you eliminate completely all the candidates not tied to win, and all the one-on-one matches and scores involving those candidates. Then you make a list of the remaining matches, from widest margin of victory to narrowest margin. You go down that list, eliminating the loser of each match, EXCEPT when to eliminate the loser would cause a circular tie with people already eliminated. Before the end of the list, there will be only one winner left.
Copyright (c) 2002 Jameson Quinn
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