John McCain canceled a scheduled appearance on CBS’s “Late Show with David Letterman” just a few hours before he was supposed to go on and tape the show that was scheduled to appear Wednesday night. However, since McCain has “suspended” his campaign, he personally called Letterman to say that he was immediately flying back to Washington D.C. to work on the bill regarding the economic crisis.

During the show though, Letterman learns that McCain was, in fact just down the street being interviewed by Katie Couric. Dave even cut over to the live video of the interview, and said, “Hey Senator, can I give you a ride home?”

Earlier in the show, Dave kept saying, “You don’t suspend your campaign. This doesn’t smell right. This isn’t the way a tested hero behaves.” And he joked: “I think someone’s putting something in his metamucil.”

“He can’t run the campaign because the economy is cratering? Fine, put in your second string quarterback, Sarah Palin. Where is she?”

“What are you going to do if you’re elected and things get tough? Suspend being president? We’ve got a guy like that now!”

The video is after the break: