Pro-choice vs. Abortion Reduction

Props to Andrew Sullivan for this link. It features a fascinating debate between feminist pro-choice folks and Democratic evangelicals who would like to reduce the number of abortions. I call it fascinating because I can't quite understand what the pro-choicers are pissed about. They say they resent the implication that having a child is more moral than not. I don't quite know what that means. Moral by what standard? Furthermore, I went and read Wallis's pitch. He's claiming you can reduce abortion by alleviating poverty, mandating paid parental leave, and upgrading access to contraception. What about that threatens pro-choicers? I don't quite understand this fight. I guess there's a libertarian/fiscal conservative critique of Wallis, but somehow I don't think that's what they're getting at. Also, I must say, Wallis's memo seems like great politics. For whatever that's worth.