New Mexico political columnist Heath Hausaman reports that Congressman Tom Udall (D) has informed party leaders that he will run for the Senate, and will announce his decision within the next two weeks. Udall would be seeking the seat of GOP Senator Pete Domenici, who is retiring.

Udall had previously backed out of the race, then informed party leaders that he was reconsidering it. Albuquerque Mayor Martin Chávez, a centrist, is already in the race.

Polling has consistently shown Udall defeating the two Republican candidates, Representatives Heather Wilson and Steve Pearce, by wide margins.

Late Update: It's official. Udall's chief of staff has confirmed the news with the Associated Press.