Frank Caliendo (Comedy Impressionist) on David Letterman For my favourite David Letterman Segments please visit my playlist here .\rbr\rbrFrank Caliendo on Letterman as Bush.\rbr\rbrGreat impressions of John Madden, George Bush, Robin Williams and many others.\rbr\rbrFunny guy gives us a laugh or two about our current and last President. Love em or hatem its no secret Bush is a bumbler.\rbr\rbrFrank Caliendo on Letterman. Funny impressions.