One of the side stories to Sen. John McCain's announcement that he would suspend his campaign, go to Washington D.C. to help with the bailout talks and push to postpone Friday's debate is that he would be canceling tonight's appearance on the Late Show with David Letterman.

So who takes his place? MSNBC's Keith Olbermann, according to TV Week.

Olbermann was last on the Late Show exactly five months ago (pictured).