McCain to Letterman: "I Screwed Up"

The GOP nominee takes all the blame with David Letterman on Thursday's show, after abruptly canceling his "Late Show" appearance last month. Deadpans: “I haven’t had so much fun since my last interrogation." Also jokes about raising Letterman's taxes, praises Palin, and makes an implied contrast between William Ayers and G. Gordon Liddy. "He paid his debt, he went to prison, he paid his debt.” Earlier: McCain arrives in the Big Apple by helicopter, due to flight delays between Philly and New York. Show airs at 11:30 pm ET/PT on CBS.