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Lieberman will not be punished because the powerful right wing of the Democratic party does not see his views as extreme. His more idiotic pronouncements are merely a caricature of viewpoints held by too many Democratic Congressmen. They get where Lieberman is coming from and don't have a problem with that. Kos always says we need "more and better" Democrats. The focus needs to be on better; forget more. Electing more Democrats who vote as Republicans just serves to demoralize progressives in the party's base.
That Democrats in Congress have no problem dissing the grass roots in the name of "bipartisanship" reflects how basically weak the influence of progressives in the Democratic party still is.