Murtha has lost it. He's demented. Lieberman - there's something likeable about him.
Lieberman's honest and stands up for what he believes.
I'd say he voted against Clinton's impeachment because he believes in the Democratic party as a whole. I don't think that's so bad.
That being said, he can't get past the MoveOners to become President, which is too bad since he's the only Democrat I know of who wouldn't be an unmitigated disaster.
D