When both candidates (who have any chance of holding power) are pro-choice, the vote is not a pro-choice vote, it's a pro-(fill in other issue here) vote.
I hope fervently that Rudy won't get the nomination, but if he does my vote for him will be a pro-victory vote, not a pro-choice vote.
Great! It will be a lot easier for a Republican liberal President to get Congressional Republicans to give him Pro-Choice, anti-gun, Pro-Gay agenda, big government legislation and judicial approvals.
A Dem would have to fight some Pubbie opposition.