Keith Olbermann is on vacation this week. MSNBC announced the "Countdown" guest hosts, including former DNC Chairman Howard Dean.

Dean is set to take the anchor chair on Tuesday and Wednesday.

The former Vermont governor posted the news on his Facebook page: "

"Howard Dean will be guest hosting for Keith Olbermann on 'Countdown' this Tuesday and Wednesday at 8 p.m. on MSNBC."

See more on this story from The New York Observer.

"Countdown" airs at 8 p.m. Monday-Friday on MSNBC.

Labels: Countdown with Keith Olbermann, Dean, Howard Dean, Keith Olbermann, MSNBC, Vermont