Maybe Thompson meant merely to say that he would not support a law that put women seeking abortion in jail. But if he doesn’t think that abortion should be generally prohibited, which his comment could also reasonably be interpreted to mean, then he shouldn’t say that he’s pro-life. He can say that he is a great ally of pro-lifers and that he would be with them on every practical issue that is before him. But if he doesn’t believe that state governments should prohibit abortion generally, then he’s not pro-life.