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Perhaps letting Lieberman keep his chairmanship of the Homeland Security Committee is a holding tactic. There are still three senate races to be decided. He keeps his chair, Democrats keep an eye on him. They see what kinds of consensus votes they can develop with the few remaining moderate Republicans, wait for the final Senate count, and then the less they need him, the shorter his leash. He can be removed at anytime, but this plays well right now to the (admittedly) mythological need for more bipartisanship that the press (and the Republicans, when they are losers) are always harping about. It looks like the usual Democratic party spinelessness, but maybe not.