Sorry I Missed It

I once again was not invited to the White House Correspondent's Dinner, and this recounting by Mike Scherer doesn't make it sound very interesting except this one part:

As is tradition, the President stood to do a short stand-up act, which included the retelling of an old joke about Vice President Dick Cheney watching Bush through a peephole in the Oval Office door while masturbating. Such is the state of Washington humor.

Um . . . really? That happened? And it's an old joke?

This article available online at:

http://www.theatlantic.com/politics/archive/2008/04/sorry-i-missed-it/44548/