This guy has got some good imitations of Bush, Clinton, Chris Rock, Charles Barkley, John Madden, and a number of other notable public figures. Pretty funny. He acts like some sort of an amateur comedian who is surprised that people find him funny. Give him a look.
UPDATE: his standup is much funnier than his sketches… the guy is going the wrong direction when he goes away from standup. The humor is when he switches rapidly from character to character, not when he does extended bits in a single persona.