Obama's appearance on Letterman the night before was the biggest show since Oprah was Dave's guest.
More than 7 million people watched president Obama visit David Letterman's CBS late night show on Monday.Obama on Letterman:
Obama's appearance -- the first by a seated president to Letterman's show -- was no match for the 13 million who turned in to that episode in December of 2005 when Dave and Oprah kissed and made up, ending a years-long feud.
But it was Dave's biggest crowd since then. WaPo