I don't think Lieberman's going to replace Rumsfeld and I don't think he expects to, but consider what it would mean if he expected to do so after the Novemeber elections. It would mean that Joe would be deliberately handing his Senate seat over to a Republican - the governor is a Republican, after all, and would appoint a replacement until the special election. If Joe were running for re-election knowing that he was going to dance into the SecDef job soon afterwards that would, in fact, be his greatest betrayal.
Still, I don't think it's in the cards.
