Why is Letterman trending?
He is an American TV Host (the Late Show on CBS)who recently interviewed Paul MCCartney. Also he is in a heated verbal battle with Sarah Palin, the former governor of Alaska.
First trend: December 12 at 06:55 UTC | Last trend: December 22 at 05:45 UTC | Last defined: July 16 at 14:13 UTC | Link: http://wttrend.com/701