Clark cuts TV ad for Lamont

The Lamont campaign has just released an ad featuring General Wesley Clark in which Clark characterizes Lieberman's support for the Iraq war as a mistake. As a likely presidential candidate for '08, it surprises me that Clark would be doing an ad attacking Lieberman now. A month ago, when Lamont was polling within a few points of Lieberman and seemed to have the momentum, sure it makes sense. But to so publicly stand against Lieberman now that he appears to be pulling away... I'm just not sure I see the logic.

Control of the Senate is likely to hang by only one or two seats, giving Lieberman an innordinant amount of power as a closeted Republican who has historically been a member of the Democratic party and has said he will continue to caucus with the Democrats should he win re-election (although I don't know how much faith we should put in his promises at this point). Does a candidate like Clark, someone who's main challenge leading up to the primaries will be distinguishing himself from the non-Hillary pack, really want to piss off someone like Lieberman? Has Lieberman really become so persona non grata among Democrats that Clark thinks it will help in the primaries (it certainly won't help in the general, given Lieberman's high approval rating among Republicans)? Does he value netroots support that much? Is it strictly about positioning himself on Iraq?