What to do About Lieberman -- UPDATED

I wonder what the Democratic Party will do if and when the newly Independent Joe Lieberman wins the Connecticut Senatorial election (he's eight points ahead in the polls). The Dems may very well need Lieberman to caucus with them in order to control the senate. But what if he chooses to caucus with neither party? What if the successful campaign by leftists to nominate Ned Lamont actually ends up costing the Dems a solidly Democratic seat?

This could be interesting.

UPDATE -- I have since read that Lieberman has said he will caucus with the Democrats if he wins. But it will still be interesting to see how that relationship works.