And would be a VERY scary person to have access to the football.
McCain is an OLD Man and isn't about to play football.
McCain has a serious disadvantage in the primaries in that he has made a lot of votes over the years. Both Guiliani and Romney can shift from past statements, but McCain can't easily do that.
In addition, he's seriously pissed off the conservative base, while the other two are better described as making the base nervous. They can probably do something to minimize that, while McCain can't win the base back no matter what he says.
McCain might win the general election, but I don't think he has a chance of winning the nomination, which makes it kinda moot.