I dont know any Christian that separates their religion from politics. Abortion, gay rights... They vote for the candidate that is closest to their religious beliefs.
Well, if we ever meet, you'll know one. I'm mainly Libertarian and support people having the freedom to make decisions that I consider a sin. Only God can judge as far as I'm concerned.
Abortion is a little different because I believe that the only laws should be based around the premises of don't hurt others and don't take what's not yours. I believe that the unborn is a human and you kill a human when you get one and you take their life which is not yours to take. That's not necessarily strictly a religious view though.