Will Pro-Choice Women Back McCain?
Fuck no.
(To be slightly fair, the answer really is "not if they know anything about McCain's actual position." Though making this position known might outrage Heartland American Religious Values Voters to whom the Democratic Party Must Reach Out, in the classic Amy Sullivan formulation, so it would be a big mistake for the Obama campaign to appeal to its base on this issue, as opposed to the other party's base. Or something.)