E&P reports:

Lieberman calls jumping to the Republican side, and tilting the Senate, "a remote possibility," which means there's at least a chance of that. Time seems to push Lieberman in this direction, as the article concludes: "Lieberman's GOP flirtation has its risks--and a time limit....The longer he waits to capitalize on his moment, the greater the danger that he'll be tagged as one of those politicians for whom having power is more important than using it."

Josh Marshall foresees calls for Lieberman's resignation if he were to make the jump.

via Greg Sargent at TPM