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The paradox is that anybody takes the trouble to vote at all. Presumably they do so on the basis of the following ethical argument: "If everyone who thinks as I do declined to vote because the individual vote is unlikely to affect the outcome, then our ideas certainly would be defeated. Therefore, I will act on the rule that I would wish all like-minded persons to act on, and accordingly, I will vote." When we apply that reasoning to minor party candidates, it goes like this: "If everyone who thinks as I do voted for a cadidate who cannot win because the individual vote is unlikely to affect the outcome, then we would obtain the greater evil rather than the lesser. Therefore, I will act on the rule that I would wish all like-minded persons to act on, and accordingly, I will vote for a 'realistic' candidate."
So if you are going to vote, you may as well vote for a major candidate. However, the problem with the second, "lesser evil" approach is that it can be a self-confirming prophecy. If everyone believes Howard Dean cannot win, then nobody supports him, and, aha! indeed he cannot win. That's also why large, sudden changes in political alignments can occur. I'm reading T. Harry Williams' biography of Huey Long, who (many believed) could not win.
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