Most of this has been discussed in other places as well, most of what I saying isn't that new, but I think putting it all together will be helpful for me.
There are a number of aspects of this topic. First and foremost is the way the media has portrayed it, left-wing feminists are going to go vote for McCain to punish the Democratic Party for not nominating Hillary. This would be stupid of them to do, as McCain works actively against their interests, and the interests of women the nation and world over. But, the media loves a good story about how women are going to do something stupid based on emotion, because women are always so damn emotional. This all obscures the fact that I haven't heard a single feminist say they would vote for McCain, even the ones who can't stand Obama.
Then which Hillary supporters are going to vote for McCain? Why the right-wing, racist, scare-mongering ones. Not that Hilary was the only one with the right-wing bigots on her side, Obama just got to keep his, for now, because he's the nominee. Had Hillary won the nomination I'm sure that there would have been just as many right wing bigots writing screeds that connected Hillary to Valerie Solanas and warned between the lines about how she would have all the men castrated and forced to do hard labor. Or something.
So, yes, some women are not going to vote for Obama because they are disgusted with the misogyny of the party and of Obama. So what? It's their damn right to, and the people that attack them for voting their conscience are simply wrong to do so.