What makes you say that? Have voters ever turned out on a national scale to support abortion? Sure, a staunch pro-life policy would guarantee losses in NY, Mass, and Cal, but Bush would likely have lost those states anyway. Americans favor limiting abortion by a large margin.
Thank you for bringing this point up. Voters, after all, had nothing to do with Roe v. Wade. I wish it were put to a vote. I may be wearing rose-tinted glasses but I do believe that abortion would be outlawed if it were left up to the people to decide.