Moving towards impeachement of Bush and Cheney would just look like a coup d'etat by the Democrats. During Watergate, the Democratic Speaker of the House maintained that he would not push for impeachment of Nixon until a VP was appointed, since the country voted for Republican rule in '72. I know that the Democrats won this year, but it is a better idea to propose a constructive agenda, let Bush reject it, and then run on it again in 2008.
The Jewish vote in CT is probably going to Lamont, because of the war, and Lieberman's closeness to Bush and the GOP. Though he has been a kind of a golden boy in the Jewish Community here since he was the first to get to the level of Vice Presidential nominee (and technically won).
I saw a new ad this morning, with Lieberman speaking directly at the camera, speaking about healthcare, the minimum wage, and several other issues, though ignoring the big one: Iraq. I don't think it will make much of a difference. His ads are rather standard campaign ads, while Lamont has had different, innovative ads.