Why Congress bucked the bailout

Looks like it's easier to convince Congress to get into Iraq than it is to get us out of an economic crisis.
President Bush's bailout bill failed in the House on Tuesday, so today it's the Senate's turn to vote on an aid package. Why is this slam dunk becoming an airball? Or, for non-sports fans, why are our Congressmen and women refusing to go along with Bush when he had such an easy time convincing the legislative branch to go to war with Iraq in 2002?
I'd say that the House, at least, has displayed more partisanship -- on both the left and the right -- in recent years. Those who voted against the bailout bill on Tuesday include not only hard-core right-wingers like Texas Rep. Ron Paul and California Congressman Duncan Hunter, but also such progressive phenoms as Dennis Kucinich of Ohio and Carol Shea-Porter of New Hampshire.
Congressmen and women aren't so willing anymore to abandon their principles for their party and/or president. But is this demonstration of principle may lead us into as disastrous a spot as the result of the pragmatism of 2002.