No, Lieberman did what he was asked and required to do as a VP during a campaign. Yes it hurt to watch Lieberman vocalize stands you know in his heart he did not believe, but were the party line of Algore et al. However, that is part of what you do when you are the VP on the ticket.
Lieberman type democrats are the types of democrats that are a dying breed. True americans and not secular socialist/communist american haters. I definately would consider him for a post in my administration if I were Bush.
The attempted theft of a presidential election was just the icing on the cake, but Loserman's easy ability to tow the party line in order to be the veep means he has no scruples. He was willing to juke to the left, in exchange for power. Even being conservative on war/security issues is not enough to earn forgiveness, since he's still a lefty on so many other issues.