If I was Dodd's opponent, I wouldn't even bother to waste time campaigning.
Everyone knows Dodd is pretty much unbeatable.
Dodd could lose a primary challenge were a Democrat with statewide name recognition bold enough to run against him. His ties to the economic "crisis" run deep, and don't just stop at his sweetheart loan from Countrywide.
I don't see the Republicans beating him without a truly stellar candidate. There aren't tons of them in Connecticut, and Governor Rell's not running for Senate.