Play of the Day -- GSA's Vegas vacation

Letterman relives ex-Current host's employment history with Olbermann

How long has it been since Keith Olbermann left MSNBC and headed to Current TV?

"After a certain point, I can't keep track of where I'm working," Olbermann joked to David Letterman on Tuesday. Luckily Letterman had a new business card for the TV personality, who was recently fired from Current.

Don't miss today's Must See Moment at 3:20 when Jay Leno explains who foot the bill for the expensive GSA event in Las Vegas.:

NEXT STORY: Battling out the GOP spending plan