The recall election against Gov. Scott Walker is scheduled, and Milwaukee Mayor Tom Barrett announces that he will run.

1. The Government Accountability Board certifies the election and schedules it for June 5. Get ready!

2. Tom Barrett, whom Walker defeated in the regular election in October 2010, has — at long last — said he's running.

Barrett, 58,the fourth Democrat to declare his candidacy in the recall election. They will face off in a May 8 primary... Former Dane County Executive Kathleen Falk was the first Democratic candidate to jump into the race, and she has already locked up most of the union support. Wisconsin for Falk - a union front group - has already spent more than $1.6 million on air time to run TV commercials backing her campaign....

This should be interesting, with the 2 Democrats attacking each other and using up their funds for the next 4+ weeks, then pivoting to try to defeat Walker one month later. Walker obviously has been fighting to keep his job and will continue to fight while Barrett and Falk (and Vinehout and La Follette) concentrate on the primary.

UPDATE AT 5:05: Friends of Scott Walker comes out immediately with an anti-Tom Barrett ad: