I've never bought in to these arguments. For a man to become POTUS he has to be pretty sharp. He doesn't have to be a genius, but he does have to be educated. Obama is very intelligent and crafty, has a nominal level of street smarts, and is educated. He's no dummy, not any more or less than Bush was.

Claiming the POTUS is dumb, stupid, etc is always the sign of a weak argument, in my mind.