The normally reliable Stuart Rothenberg, on one possible consequence of a Ned Lamont victory:

Some Democrats fear that a three-way contest could encourage Republicans to find a way to force their nominee out of the race and replace him with a much more serious Senate candidate. But a Lamont victory would not seriously threaten the Democrats’ hold on that seat unless the Republicans were to find a stronger nominee.

Lamont’s victory, however, would not be without its downside for Democrats, since it would only embolden the crazies in the party, a consideration not lost on other Democratic elected officials and strategists.

Lieberman’s defeat is likely to add to the partisanship and bitterness that divides the country and Capitol Hill, and to generate more media attention to grassroots bomb-throwers who, down the road, are likely to make the party less appealing to swing voters and moderates. (emphasis added)

Last time I checked, it was the "crazies" in the party that unquestioningly supported the Bush Administration's policies in the Middle East. After three years of abject failure and lowered national prestige, those in the Democratic Party who continue to back the Neocons' Grand Adventure are certainly more nuts than anything Little Green Firedogs might be blogging about this week.