He changed his views before campaigning for his first Senate run. His votes in the Senate were pro-life.
Voted YES on maintaining ban on Military Base Abortions. (Jun 2000)
Voted YES on banning partial birth abortions. (Oct 1999)
Voted YES on banning human cloning. (Feb 1998)
Yah? So what? Most people voted that way, including Democrats.
A few good votes around the edge of the issue doesn't make you pro-life.
Look, I like Fred Thompson, but let's not call him what he isn't. He's not pro-life. Neither is Giuliani. If you are OK with that, great, I think he'd make a good President in spite of the fact that he's not pro-life even though I am.