Man oh man. This is a first.
I agree with Hillary here. If the voters in the Democrat party choose a candidate, as a member she should support that candidate. That is what representative government is all about.
Politically, she would have been a heck of a lot smarter to just keep her mouth shut if she didn't support Lieberman. Or, perhaps given her current status amount Dem leftists, she is trying to help him out. Who knows.
All I know is that the Democrats (and Republicans for that matter) should elect whoever they please and the party elites need to endorse that person unless there are very unusual circumstances like criminal malfeasance.
I agree with you: the problem here is she opened her mouth.