In case you had any doubts, the AFL-CIO will work to defeat Bush, whomever they support in ‘04; this, from a story about Gephardt courting them:

Sweeney said no matter what happens on the question of endorsing a candidate in the Democratic primaries, labor will be united next year against Bush. “I don’t believe there will be any major splintering of unions,” he said. “I think we’re going to do our damnedest to have a solid labor movement and a solid political program all across the country.”