Atrios is right, though I’d put it a bit differently: centrism is a pose rather than a philosophy. And to support that pose, the centrists are demanding $100 billion in cuts in the economic stimulus plan — not because they have any coherent argument saying that the plan is $100 billion too big, not because they can identify $100 billion of stuff that should not be done, but in order to be able to say that they forced Obama to move to the center.
Which raises the obvious question: shouldn’t Obama have made a much bigger plan, say $1.3 trillion, his opening gambit? If he had, he could have conceded to the centrists by cutting it to $1.2 trillion, and still have had a plan with a good chance of really controlling this slump. Instead he made preemptive concessions, only to find the centrists demanding another pound of flesh as proof of their centrist power.
I hope Obama has learned this, too.