Lieberman plans to campaign for Republicans in 2010.

McCain, Lieberman, and Graham After joining with Republicans this week in a promise to filibuster health reform if a public option is included, Sen. Joe Lieberman (I-CT) tells ABC News that he plans on campaigning for some GOP candidates in the 2010 elections:

I probably will support some Republican candidates for Congress or Senate in the elections in 2010. I’m going to call them as I see them.

There’s a hard core of partisan, passionate, hardcore Republicans. There’s a hard core of partisan Democrats on the other side. And in between is the larger group, which is people who really want to see the right thing done, or want something good done for this country and them — and that means, sometimes, the better choice is somebody who’s not a Democrat.

Lieberman also said it remains an “open question” whether he will seek the Democratic nomination when he runs for re-election in 2012. Last month, Lieberman also joked that he may run as a Republican. In September 2008, Pennsylvania Sen. Arlen Specter — who was then still a member of the GOP — ironically said that Lieberman was “practically” voting as a Republican already and should just switch parties.