The Democrats are in power and they'll approve anything Obama sends them. That's the way America's political system works. Its the liberals turn to screw things up. Hopefully they'll do a bang up job and by 2010-2012 elections the GOP will gain back power and push the conservative agenda for all its worth.
Actually, if there was an active campaign being waged by serious candidates to pledge as I've proposed, it would serve to undercut support for any of Obama's future spending plans. These politicians look after themselves FIRST and might think twice about what they vote for, especially if it will be DE FUNDED anyway in two years.