Many women simply will not vote for an anti-choice candidate for office. Women voters take the trouble to find out where candidates stand on issues that are important to them and make their political decisions accordingly. Al Gore's surge in the national presidential polls has been powered by women. Gore has gained 13 points among women, but only 4 points among men. This trend applies to the New York senatorial campaign, where Clinton has drawn women voters from Lazio by stressing her commitment to abortion rights and casting doubt on Lazio's claim to be pro-choice.
Women know their issues and they vote on their issues.
Yes, the choice issue engenders a gender gap.