Yep, they are saying that they are very, very, disappointed.
Sorry, but Lieberman jumped the shark when he refused to investigate failures during Katrina; in which he clearly showed that he was aggressively covering up for Bush and His Evil Minions&trade, and you did not do anything then.
And we are supposed to expect that you will do something now?
Fool me once, shame on you, fool me twice, we won’t get fooled again.