Did John McCain just make his first edge toward that (hollow) apology that Joe Klein says he'll never accept?

(To be clear: Joe was referring to McCain's established pattern of engaging in sleazy or dishonest behavior knowing he can latter come back to the Washington bigs, moral hat in hand, for absolution.)

So after running the sleaziest and most dishonest campaign in modern presidential campaign history, now McCain 'regrets' the negativity.