Bush will sign the bill because he believes his popularity would suffer if he vetoed it. There's no big conspiracy here.
The scenario I outlined is the only possible explanation, IMHO, although the fact he said "send me a bill, and I'll sign it" before Jeffords switched may also be a factor.
But think about the opposition here, folks. We know that Daschle and the others Dems have chosen to say or do anything to get and maintain power. Do I put threatening to pull the rug out from under our troops beyond him? No.
The fact is, Enron had him in a box, and the Dems pushed hard and ruthlessly. Let's try to keep Daschle from that sort of power after November.
It's the best we can do, until we defeat that punk in 2004.