http://www.nytimes.com/2004/01/10/politics/campaigns/10LIEB.html
This NY Times article touts Lieberman's support from Republicans, including many who won't be able to vote for him in primaries. Since we know Joe can't stand Dean, and he and his supporters (such as they are) keep insisting that he truly opposes Bush, if Dean gets the nomination maybe Joe should run as an Independent in 2004.
I know there are downsides to this strategy. For one, John Rowland or his successor would get to appoint a Republican to replace Lieberman in the Senate (unless Joe changed his registration to Independent but kept caucusing with the Dems, a la Jeffords). Two, insomuch as there really is an ABD sentiment within the Democratic Party, Lieberman would peel off virtually all those votes.
I'm not even sure I buy this myself. But I think there are a lot of Republicans out there who aren't thrilled with Bush, but wouldn't vote for Dean after the SCLM gets done tarring him as a flag-burning baby-eater. Depending on how many of those folks there are, introducing a centrist third-party candidate like Lieberman--who, like Perot in 1992, probably would concentrate his fire on the Republican-- could make it easier for a real Democrat to win in 2004.