A majority of Republicans would likely reject any pro choice candidate.
specifically, what are the numbers?
what % of americans are repubs?
what % of them polled said they would reject a pro-choice candidate.
I think if BOTH candidates were pro-choice, they would select the (R) anyway. Even if only to vote against a spend-happy lib. Obama won not based on his own merits, but because he was perceived as the anti-bush.