I mean, this isn't some random bill we're talking about. This is the bill that funds the war. If Bush vetoes it, he runs out of money. At which point, either he brings the troops home sooner, or we get a truly lovely little constitutional crisis over where the money's coming from. Bush can't just invent money, AFAIK: if he wants to keep the war going, he ultimately has to take it from somewhere else, and there aren't many somewhere elses that can casually give up that much change.
Okay, yes -- I don't expect the major media to spend much time on interesting political analysis. But I'm genuinely surprised that they're only talking about one move forward in what is really a fascinating political chess game...