Don't be a sucker.

Greg Sargent explains...

...the truth is this: Lieberman is virtually certain not to switch. The Senate map for 2008 looks like tough sledding for the GOP, so if Lieberman switched parties, he'd be at grave risk of relegating himself to the minority for years to come. And as you've probably noticed by now, the last thing Lieberman wants is to be considered irrelevant. Every time he hints that he might switch, he's doing it to get attention -- nothing more, nothing less.

In fact, Joe Lieberman is going to vote with the caucus 90% of the time on 90% of the issues before the Senate, as he always has. He's a marginal man, and he'd be even more marginal across the aisle.

He'll be infuriating from time to time, but he's best ignored.