[QUOTE=Giles]
In the system used in the US, John Doe’s most rational vote would be for the Democrat candidate, even though the third party might be closer to his personal position. In the system used in Australia, John Doe’s most rational vote would be for the Social Democrat candidate, with a second preference going to the Democrat, because he’s more likely to get a candidate he wants elected that way.
So if you want to work out what would happen in a US House of Reps election with proportional representation, you shouldn’t just look at the voting figures in present elections, because some votes will change: some people will be voting Libertarian, or Green, or for independents, or for conservative Christian candidates, instead of Dems and Repubs, because they will no longer be “wasting their votes”.
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Yes, that was precisely the point I was making with my example. In a winner take all system there’s no real motivation to support a party that can only get around 10% of the votes.
Third parties aren’t impossible under FPTP. But there’s a very distinct difference between “multi-party” systems wherein more than two parties regularly have a hand in government and essentially two-party systems with “aberration” third parties that get a few seats in the legislature here and there but never really take a hand in governing.
The NDP for example, could definitely exist in the United States. In fact there’s been a few times we’ve come close to establishing a party like the NDP (not necessarily in politics, but rather a small, third party that has a consistent presence in the legislature but virtually never takes a hand in governing) the Progressive Party and in more recent years the Reform Parties came very close to becoming viable, small third parties. They both just collapsed due to internal incompetence more than anything else.
I guess the question is, what is your motivation. Do you want to foster the development of small, mostly irrelevant third parties like the NDP or the Lib Dems? There are ways to do that. In fact, there’s even ways for coalition governments to happen in the United States. Of course, coalition control of the House or Senate does not equate to control of the White House as the U.S. does not employ a Westminster political system. But if there was a Social Democratic party that won 25% of the seats in the House, the Democrats won 40% of the Seats, and the GOP won the remaining 35%, there’s nothing Constitutionally that would prevent the Social Dems and the Democrats from caucusing together to appoint a Speaker and et cetera.
Realistically two things have to happen if you want to see a party like the Lib Dems or the NDP survive in the United States, the first, and biggest one is, a party with coherent leadership and some appreciable degree of political appeal has to be established. The Progressive party and the Reform party (to a much lesser degree) were making inroads in that regard, but both mostly fell apart due to lack of coherent leadership, which is more or less their own fault and not the fault of the FPTP system.
But if you want a real multi-party system, and not a system like in Canada where you have the NDP which has never formed a government but can have some influence on legislation then you have get rid of FPTP voting, and go to proportional voting.
When I think of a country as being a “two-party” system, I take that to mean “two party rule” ie, one of two parties rule. In the UK, it’s always been the Tories or Labour (or its predecessors) forming governments. Coalition governments have been exceedingly rare, and throughout the country many seats are only really contested by candidates from two parties.
Canada is a “two-party” country with a strong regional party which distorts the picture somewhat. But essentially, Canadian history typically shows that either the Liberals or the Conservatives form a government. Even during the long, long period where the Conservatives fractured into multiple parties and the Liberals almost universally formed governments, Canada wasn’t really a one-party system, it was a “two-party” system in which one of the parties was fractured and in bad shape for a long time, not entirely unlike the condition of the Democratic party in the United States for many years following the American Civil War.
I don’t define “two-party” as meaning “exclusively” two parties, because even the United States has many “third parties” but rather a system in which one of two parties almost always runs government. And that’s pretty much the system the U.K., Canada, and the U.S. have. Because of the way parliamentary government differs from the American system, there’s some situations you would see in Canada and the U.K. that you wouldn’t see in the U.S. But since neither of the three countries employs proportional representation, neither of them are true multi-party systems.