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What would the US Congress look like if the STV system of proportional representation was used to elect it?

Let's assume the system was changed in the sixties for some reason.

STV - http://en.wikipedia.org/wiki/Single_transferable_vote

Let's assume the House of Representatives http://en.wikipedia.org/wiki/House_of_Representatives_of_the_United_States uses anything from 3 - 5 member constituencies depending on the number of congressmem per state, with the more seats the bigger the constituencies, so California has 11 constituencies, 10 with 5 members, and one with 3. States that are currently only entitled to one or two members would still only be entitled to that number, and their seats would be elected under the AV system (http://en.wikipedia.org/wiki/Alternative_Vote)

The Senate is elected using the AV system in every state.

The Presidential election is the same, and the role of president is unchanged.

Some states have adopted PR for state and local elections, but many have kept the old system.

What would Congress look like now?

Would the Democrat and Republican parties even exist right now? Would there be Socialist, Green, or Constitutionalist reps?

My gut instinct is that there would be three main parties - a socially liberal economically conservative Republican Party, a socially conservative, econmically centrist/rightwing Christian People's Party, and an economically centre left/liberal Demcratic Party, with a scattering of Greens, Socialists, Constitutionalist, Libertarian, regionalist, and fringe types getting elected on a short term local protest vote, or name recognition basis.

I think that if you kept a strong FPTP presidential system, the political makeup of the US would not change massively. It wouldn't automatically go european.
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