Except for Fred Thompson we don’t have a conservative thoroughbred in this race that stands half a chance of getting nominated. The question should be who would be the most and the least likely to advance a liberal agenda if made President? I would put McCain as the most likely because he has already proven he would go against conservative principles if he thinks its the right thing to do, regardless of what it does to his poll numbers.
Romney and Giuliani are liberals. They’ll govern as liberals.
Thompson and Hunter will govern as conservatives.
Huckabee will govern as a blue-dog democrat
McCain would govern 1st term as a Rino Republican.
Paul would govern as a Libertarian.