He'd be a whole lot better than McKook.
This is a very serious question. On a whole host of issues, McCain is far more conservative than Guiliani, but I have to agree. McCain's a very dangerous person who would explode under the kind of media barrage that a president is subject to.
I'm not fond of Guiliani, I don't think he'd expend any capital for constitutionalist judges (I think he'd rather find common-sense, wise jurists...like himself) and despite his fondness for the social left, it's not that he'd be a activist leftist, but he wouldn't fight any of the wacky new ideas that they come up with.
That being said, McCrazy is just dangerous.