Now he's really done it! In his rousing endorsement of John McCain and Sarah Palin at the RNC on Tuesday, Sen. Joe Lieberman may have pissed off his own party for the last time. The Connecticut Democrat's criticism of Barack Obama was not surprising given his long-time support for McCain, but the high-profile venue made his betrayal that much worse.

Lieberman may be punished by being stripped of his committee chairmanship:

During the speech, the Connecticut senator praised GOP presidential candidate Sen. John McCain and criticizing Democratic nominee Sen. Barack Obama.

"The Democratic Caucus will reassess the situation with Sen. Lieberman after the election," Jim Manley, a spokesman for Senate Majority Leader Harry Reid, said Wednesday.

Lieberman, the Democratic nominee for vice president in 2000, now calls himself an "independent Democrat," but he remains a member of the Senate Democratic Caucus which allows him to head the Homeland Security and Governmental Affairs Committee.

It's unclear what Lieberman would do if he lost his committee chairmanship. One option would be to join the Senate Republican Caucus, but that would doom him to reside in an impotent minority in the chamber.

A better choice, in my opinion, would be to start a new third party, dedicated to tough foreign policy and social liberalism. Most importantly, this new party would be in favor of marriage equality, so that Lieberman can finally gay-marry George W. Bush!