A new Gallup Poll, conducted May 7-10, finds 51% of Americans calling themselves “pro-life” on the issue of abortion and 42% “pro-choice.” This is the first time a majority of U.S. adults have identified themselves as pro-life since Gallup began asking this question in 1995.
The May 2009 survey documents comparable changes in public views about the legality of abortion. In answer to a question providing three options for the extent to which abortion should be legal, about as many Americans now say the procedure should be illegal in all circumstances (23%) as say it should be legal under any circumstances (22%). This contrasts with the last four years, when Gallup found a strong tilt of public attitudes in favor of unrestricted abortion.
at the link above, there is a lot more information as well as pretty charts.