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If the Democrats had over 60 votes in the Senate, they would be able to throw Lieberman under a bus.
The only way they would side-step the ugly situation with Leiberman is to decide to eliminate or modify the filibuster, and that's something they just won't do.
It is tough-tough-tough to argue with the constituents who reelected him as an independent. I think they made a mistake, but I don't vote in that state, so...