I hate to keep harping on the same subject, to the point where I'm starting to sound like a broken record (note to readers who don't know what this means: Ask your parents...), but it's the story that won't go away.
Katha Pollitt over a The Nation has an incisive take on the phenomenon that is definitely worth a read:
Are there feminist Hillary supporters who hate Obama so much they'll vote for McCain just to show the Democratic Party how ticked off they are? Yes, and I get e-mails from all five of them. Seriously, I'm sure there are female Hillary Clinton voters who will go for John McCain in the general election, but I don't think too many of them will be feminists. Because to vote for McCain, a feminist would have to be insane. Let me rephrase that: she would have to believe that the chief--indeed the only--goal of the women's movement is to elect Clinton, not to promote women's rights. A vote for McCain would be the ultimate face-spiting nose-cutoff. Take that, women's equality!Check it out and you'll see, more eloquently, in more detail and with more authority, my argument against feminists voting for McCain.