Michele O'Callaghan tributes on Letterman, Olbermann

Michele O'Callaghan, a longtime TV makeup artist who worked for "Late Show with David Letterman" died Dec. 16 after a long battle with cancer; she was 48. Last night she received two on-air tributes -- at least two, and there may have been more that I overlooked. Years with NBC and years with CBS, she left behind many many friends. David Letterman's tribute: Meanwhile, Keith Olbermann had this to say ...