I would have had no problem with either Romney or McCain as a President. I think they are both moderate (Romney probably a little more), they both have stood up for what they believe in, but have not tried to impugn others beliefs (again, Romney a little more). There are things I disagree with both of them on, but I respect them.
I don't respect Paul Ryan. He's a spineless, gutless wet paper towel who will do anything for political favor.
Would not have liked McCain. That man never saw a war he did not want to commit troops to.