just a quick comment on a minor point: IRV may be a counterexample, but I suspect that (1) it has only been > adopted in very "liberal" cities,
I don't think that's because they're liberal, per se, but rather because they were burned by the 2000 election. We'll see how it works after a conservative Nader throws a national election to the Democrats. (Of course, right now, Republicans go out of their way to at least apear to kow-tow to the conservative base, while Obama goes out of his way to at least appear to distinguish himself from the liberal base, so Republicans have far less need for a third-party candidate. But that can change.) JQ
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