Did the White House fake out Gettlefinger? Get him to turn down a somewhat unattractive deal from Corker by signalling that they were ready to tide GM over, and then pull the deal? I don't know that bankruptcy will destroy the UAW, but they probably won't have a lot of members and money left to campaign for Democrats in 2010.
What remains to be seen is whether GM really can't make it to January 21st without a cash infusion, or whether that was just a negotiating tactic. I tend to think they meant it, but these sorts of pleas are usually exaggerated to get the best possible deal, so it's impossible to know.