The union said Monday it won't choose a national candidate for the primary elections, underscoring divisions that had been apparent among SEIU supporters of Edwards and the Democrats he trails in national polls:and .
"Any one of these candidates would help create a new American dream for workers and their families," SEIU Secretary Treasurer Anna Burger said.
Instead of making a national endorsement, the union will allow its locals to make decisions state by state.
"Given the importance of this election, we are encouraging members and leaders to act on their passion for the candidates and get involved on a statewide basis," SEIU President Andy Stern said.
SEIU backing was one of the most important labor endorsements available. The organization has donated more than $25 million, mostly to Democratic candidates, since 1989.
Edwards had hoped a national SEIU endorsement would energize his campaign in the crucial early primary states. The former North Carolina senator and 2004 vice presidential nominee has spent considerable time the past couple of years walking picket lines, speaking out for workers' rights and seeking labor support.
Clinton and Obama also have been working SEIU hard, with the union endorsement being one of the endorsement plums still left.
But now instead of spending its money in a primary campaign, the international union will devote its funds to national issues until the Democrats have picked a candidate.
"We will continue to work on issues like health care, the war in Iraq and other issues while our locals decide whether they want to endorse a candidate in the Democratic primary," SEIU spokeswoman Stephanie Mueller said.
The 1.8-million member union winnowed the Democratic field to Clinton, Obama and Edwards after the three were the clear favorites at an SEIU forum in Washington in September. The union delayed an endorsement because of the deep divisions among its members, and delayed the decision again after hearing from the candidates anew in Chicago at the Change to Win labor federation conference.