Letterman Rips Into McCain

Leaked in advance of tonight's show.

"Something is starting to smell. That's not the John McCain I know. This is not the way a tested hero behaves. Somebody's putting something in his Metamucil."

Late in the clip, Letterman cuts to live shot of McCain sitting a couple of blocks away in an interview with Katie Couric. NOT rushing to the airport as he told the Letterman people when he canceled.