Sen. Joseph Lieberman, I-Conn., just endorsed Republican John McCain’s bid for the presidency, Saying:

"I know it’s unusual for a Democrat to be endorsing a Republican…"

Except for one thing Sen. Lieberman — you’re not Democrat.

UPDATE:  Ned Lamont, the Democrat that Lieberman defeated in 2006, says:

During our debate last year, Senator Lieberman intoned that he wanted to "elect a Democratic President in 2008," and that my election would "frustrate and defeat our hope of doing that." With his endorsement of John McCain today, it is now clear that Joe Lieberman is the one working to defeat our hopes.

Yup, that’s what Lieberman said: