Former (maybe current) comedian and current US Senator Al Franken of Minnesota has gotten some YouTube love from his recent visit to the Minnesota State Fair.  Here he draws a map of the United States from memory:

And here he debates some folks about health reform and manages to actually have a novel thing called a conversation with them.  Credit also goes to the crowd for treating him with respect.

Love him or hate him I don't think there's much doubt that the man is sharp.