Al Franken is in it to win it:

WASHINGTON (AP) – Comedian Al Franken has decided to run for the U.S. Senate in Minnesota in 2008, challenging incumbent Republican Norm Coleman, a senior Democratic party official said Wednesday.
The official, who requested anonymity because Franken has not made an announcement, said the comedian and former star of NBC’s “Saturday Night Live” told her of his decision recently.
Andy Barr, political director of Franken’s Midwest Values Political Action Committee, declined comment.