Anyone else cynical enough to think McCain's blowing-off the Letterman Show was a calculated ploy?

Surely the media-savvy Republican election machine ought to have known Letterman would find out he was lied to and McCain wasn't rushing back to Washington to deal with the financial crisis and instead gave an interview to Katie Couric? And that D.L. would harp on it?

All to grab some headlines during a flagging campaign and pump up the audience for the show when he DID appear and graciously admit that he "screwed up"?

Didn't hurt the Late Show's ratings that night either, did it?