I agree that Lieberman is a man of integrity, and if we absolutely had to have a hawkish administration, he'd probably be a good Secretary of Defense, one in the mold of Robert Gates. Unfortunately, I've lost a lot of respect for him over the last two years; his comments about Alberto Gonzalez's performance as Attorney General, Obama's readiness, and even McCain's tax policies (yet we're supposed to believe he remains an uberliberal on economics???) all cross the line he set for himself when he first said he would only prop up McCain and never tear down a Democrat.
Nevertheless, if bucking party lines and endorsing the other guy is the standard by which you judge honesty and integrity, I've got a heckuva list for ya: where McCain has Lieberman, Obama's got fmr Secretary of State and retired Gen. Colin Powell, fmr Bush press secretary Scott McLellan, fmr Gov. Bill Weld (R-MA), pundit Christopher Buckley, and Sen. Chuck Hagel (R-NE)'s wife. I presume Hagel himself will vote for Obama but is just keeping quiet to avoid making waves.
Yeah... it's been a good week.