You first came to our attention as the protege of William F. Buckley. This was not a good sign, but it's a big tent party. Ten years ago, you were the first Democrat to give aid and comfort to a partisan witch hunt against a president of your own party, and hardly an extremist member at that, for his personal failings and his regrettable attempts to hide them. But it's a big tent party and the GOP never had the votes to convict and remove. It is thus exceptionally displeasing, but can be forgiven. Indeed, you may remember that you ran for vice president in 2000 despite all the events of 1998 and 1999.
But then, Joe, you left the party because it chose someone else instead of you in the primary. That's not polite. It's a big tent party, but if you're prepared to leave the party and run anyway because it rejects you (which your primary opponent pledged not to do) then you really have no loyalty to the party at all.
Still, many things can be forgiven. Joe, you've been voting with the Republicans like crazy. You're a big Bush supporter. You campaigned for the other guy, and repeated the worst lies and smears leveled against the guy who was supposed to be your guy. Then you went to the other guy's convention and foamed for them on command.
Joe, the party can count to 51 without your help now. It doesn't need you and you haven't given it good reasons to keep you around. Frankly, a lot of the Democrats pretty much hate your guts and it's not because they're assholes. It's you. Now it's time for you to accept some consequences of your actions. This is personal responsibility.
Unfortunately for the Connecticut Senator, it is highly unlikely that Democrats would act against the wishes of Majority Leader Reid, who wants Lieberman to give up his chairmanship. Moreover, progressive activists have been anticipating this move for months, and have organized efforts to pressure steering committee members to strip Lieberman of his perks.