I've been planning on posting some Frank Caliendo video for a while. The man is a master at impersonating politicians, athletes, broadcasters and celebrities. He does President Bush, President Clinton, Al Pacino, Charles Barkley, Bill Walton and Robin Williams. But I'd have to say his signature character is John Madden.
(Click here for a clip of the real John Madden talking. Note the similarities?)
Here is a crazy mix of impressions from an appearance on WGN.
And more on David Letterman as he goes presidential.