September 27, 2012 British Prime Minister David Cameron was confounded by some obscure British history questions posed during an appearance on Late Night with David Letterman.
In this image taken from video and provided by Worldwide Pants, Inc., Republican presidential candidate Rick Perry presents the "Top Ten Rick Perry Excuses," on the set of the Late Show with David Letterman.
November 11, 2011 On David Letterman, the Texas governor had some fun at his own expense. Excuse No. 10: ""There were three reasons why I messed up last night: 1) The nerves 2) The headache and 3) Um...Uh...Oops."
June 16, 2009 Not so funny: David Letterman faces calls for him to be fired over a joke about Sarah Palin's daughter.
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