No we don't. Being a Democrat (or a Republican) does not mean always supporting the Democratic candidate.
The people like myself who advocated Lieberman's defeat in 2006 were attacked and called every name in the book. We were right about everything, every accusation.
You abandoned a guy based on 1 issue, and then called him a traitor because he didn't agree with you. It's his right to support the war if he wants; remember, without him, we wouldn't have the Senate majority this year. He could've voted with the GOP, but he chose to vote with us, because he is a Democrat....
....campaigning for the Republican candidate and going to the Republican convention..