DAVID LETTERMAN MOCKS JOHN MCCAIN FOR CANCELLING SHOW APPEARANCE DISS VIDEO

Late Night funny man David Letterman ripped into Republican candidate McCain for lying about the reason why he canceled his appearance on the Letterman show. John McCain did however conduct an interview with CBS correspondent Katie Couric at the time Letterman's show was taping. David Letterman even went as far to suggest that McCain's reason for calling off his debate with Barack Obama and dissing him were due to the fact that he is trailing in the polls. Letterman states in the clip.  "You don't suspend your campaign. This doesn't smell right. This isn't the way a tested hero behaves." And he joked: "I think someone's putting something in his metamucil."