If Joe Lieberman joined the GOP, he would flip control of the U.S. Senate. That is reason enough to hope for such a thing. As for his views, it's worth remembering that Senator Ben Campbell of Colorado wasn't a conservative, but the GOP welcomed him into their caucus anyway.
Campbell wasn't a liberal either. He was a true centrist, unlike Lieberman, who's just liberal in domestic issues and conservative in foreign policy. Don't get me wrong, if he wanted to switch, I'd take it, but I don't see it happening.
Here is why: The D's know its a possibility. They know he can yank the rug out from under them at any time. Because of this, he's the most powerful Senator in the Senate, and he knows it. He can blackmail the D's to get whatever he wants out of them. So why would he switch? If he does that, he risks being marginalized in the unfortunate event that the D's gain in 2008. He keeps the most power by staying on the D side with the option to switch if they pi$$ him off too much.
That said, if he did switch, it would sure be interesting to watch the media throw a fit...and somehow justify why they threw a fit this time and not when Jeffords switched.
He doesn't need to join the GOP, he can caucus with them without switching his "Indy" party label. The problem with the "Hamlet of the Potomac" is that he always says he's going to do this or that, but he still tends to uphold the 'Rat party line. If he was truly interested in repaying the GOP for dragging his butt across the line to reelection, he could've forced a power-sharing agreement where we split the chairs on the committees. He owed us that at the very least.
As for Ben Nighthorse Campbell, his ACU rating was more towards the liberal side of things, but he moved dramatically rightward once he crossed the aisle. Lieberman remains mired in the far left single (or zero) digits.
Lieberman's ACU rating is 17. That's 20 points lower than Lincoln Chafee. Plus, Liberman votes to support the Dem blockade of judges. I wish Liberman lost to Ned Lamont. Let the moonbats have all the tv face time as possible.