Andrew Sullivan has a series of posts on the Republican party as the party of torture. I can't add anything to what he's said (at least not right now), but I think you should take a look at them.
The Party of Torture
Torture, Moral Vanity, and Freedom
Email of the Day
The Military Versus Torture
The Party of Torture
My only comment is that John McCain, in the latest Republican presidential debate, said what I've been saying all along: It's not about them, it's about us.
Update:
Jack Balkin also has some good comments.