Bush isn't going to make abortion illegal, he'll just keep the legal harrassment up. He's just a flirt, he wants your vote, but he can't do anything very substantive. If you want to decrease the number of abortions, you either have to improve birth control, or change our culture. Good luck on the culture thing.
Bush has been bad at improving birth control. His abstinence-based programs, for one: they don't increase abstinence, and actively lie to youth about basic sex education (for instance, slandering the effectiveness of condoms). The people behind these programs are just plain liars. I'm sure they think they are doing the right thing, that it's better to lie to youth to scare them straight. I disagree with that on principle, but from a practical point of view it has also failed.