I think it depends. Is it a knock down, dragout fight, or are there strict rules? If there are no rules, I suspect McCain would fight dirty, or at least dirtier. I can see him picking up a chair and breaking it over Obama’s head, I can’t see Obama doing the same to McCain. Could McCain catch him? Maybe, even for a 72 year old man he seems to be in reasonable shape. But compared to Obama he’s short, and Obama is fairly athletic himself (though McCain is more “built”). I think Obama could outrun McCain, because of a) the height differential and b) the natural competitive advantage inherent in the structure of the afro vs. anglo man (and I’m not being racist by saying something stupid like blacks are better runners, I’m saying physiologically there is indeed a mechanical advantage for Obama, but even if there isn’t, the height differential means Obama has longer legs if nothing else). I suspect Obama would run if he saw McCain pick up that chair.
So, I think in a no holds barred match, it really depends on strategy. If Obama adopted a mostly defensive, tire him out strategy, absolutely he could win. I think Obama is far more crafty and able to think on his feet than is McCain. Just think about when McCain was asked if he thought it was fair for insurance companies to cover Viagra but not birth control, he essentially told reporters he couldn’t remember his own position on the issue and they should check his voting record! I think Obama could find creative ways to avoid McCain so he could make easy work out of him, and would then be able to go in for a clean kill. But I think McCain could take Obama if he got in a lucky shot or if Obama didn’t bring his A game strategy.
Now, if it were a strictly regulated event, no hitting below the belt and such, given Obama’s finess for working the system and understanding every fine detail of any given set of rules, and McCain’s proclivity towards short temper, Obama would be able to get inside McCain’s head and make him cross the line, and Obama would have him disqualified. Of course, again, McCain could still get in a good shot or two before it would matter. His biggest problem however would be again the height differential. Even if Obama had to engage him hand to hand, if it were say a boxing match, McCain would have a hard time landing one across Obama’s face (he’s quite a bit taller), but Obama would have access to just about anywhere a boxer would hit, and would indeed have a hard time hitting below the belt.
I think advantage Obama, about 65/35, pretty much the same as the election.