The AP reports that the SEIU will endorse Dean tomorrow. But the only person who'll go on the record says that until they officially decide, everything is speculative:

Howard Dean is getting a prized presidential endorsement from the AFL-CIO's largest union, top officials from the Service Employees International Union told at least three Democratic campaigns Wednesday night.

[...]SEIU's endorsement will be announced Thursday after the union's 63-member executive board meets with the former Vermont governor and Democratic front-runner, campaign sources said, insisting on anonymity.

SEIU spokeswoman Sara Howard said Dean is the only candidate being considered, but the board could decide not to endorse anyone.

Yesterday in one of the comments threads at BFA, someone (not a DFA staffer on the official blog) posted the phone number of SEIU HQ and urged Deaniacs to call and beg for the endorsement. Deaniacs did so in such numbers that staff finally had to post a note on the blog asking people to stop calling. One thoughtful BFA commenter sent the person who answered all those phone calls flowers today as a gesture of appreciation and apology for any perceived harassment.

What a campaign.