If Democrats Wanted To Be Serious

This wouldn't even be debatable. The idea that Senators who vote to filibuster major initiatives of the party -- filibusters that are highly deleterious not only on the policy merits and for democracy but politically -- should be entitled to special policy-making privileges from the party is absurd. (For Lieberman, of course, this doesn't go far enough; his office should be transferred to a broom closet somewhere in Camden.) It should also be noted that while there may be certain risks in alienating Senators in red states, this doesn't apply at all to Lieberman.