Lieberman would have nothing to lose from switching, really. A case can be made that he is actually better liked among Republicans then Democrats, plus there is no way he is winning his primary in 2012, after opposing Obama. I'm not sure whether he would go through with it, but it definitely is a possibility.
Per my intuition, it was more of a possibility for Joe to caucus with the GOP before folks like Castle, Simmons, and Campbell were eliminated.
Perhaps, but I don't really see why their elimination would make him hesitate to do so, especially if the GOP makes a deal allowing him to keep his beloved chairmanship.
Fewer somewhat congenial to quite congenial (Castle), chaps would be around for Joe to commune with, is the reason. But if Kirk wins, he will have a congenial there, along with the Maine sisters, and Brown, and maybe will get along with Ayotte, so I certainly don't exclude it for that reason, plus the one you mentioned - power. He can hang out with John McCain and Lindsey Graham, his BFFs.
Lieberman is much more likely to switch than Ben Nelson in that scenario.
