It is an isn't a waste of time. The more pressure the base puts on Dems - which is what leadership both expects and wants - the easier it is for them to justify stripping Lieberman of his committee chair. It goes something like this: Joe we'd consider doing it but our base just won't allow it. So meet us half-way. You can stay in the caucus but have to leave your committee post.
Dem leadership needs the base to provide a reason to toss Lieberman out. It's a game of theatrics. But if nobody seems to care about Lieberman staying at the head of his committee then it becomes a lot tougher to push him out.
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