He realizes that his presidency is in shambles... with shitty approval ratings, a loser war that he started, Katrina screw-up, Walter Reed scandal, etc.  The guy knows that he's f*cked and he's just staving off the inevitable.  With each latest scandal, he's sinking deeper and deeper.  Right now he's struggling to keep his chin above the quicksand. (unfortunately, that's why we can still hear his indignant outrage)  His whole presidency is a corrupt, partisan house of cards that's falling apart before our very eyes.  He can't stop the inevitable.  Sorry, dude-president, you lose, loser.

P.S.  Maybe it's a good time to offer an open invitation to the few Republicans who are still in touch with reality (Hagel, Specter, Snowe, Collins, Graham, etc.) to abandon their sinking ship (Bush presidency and whacked-out Republican Party) and join the Democratic Party.  If we got a few of them on our side, we could also dump Lieberman for good.