In bodybuilding terms, as a black man, Barack Obama will have no calves, hence his ability to do well for the bodybuilding world will be negligible. However, his bodyfat looks low - I'm saying 0% a la Flex Wheeler as measured by Jim Quinn at the Arnold Classic, the lowest level of bodyfat measured at the time.
John McCain has chipmunk cheeks a la Tom Platz - you can tell he's put the hours in at the gym to attain that jaw.
But as for the real thing come November, Obama by a landslide.