Why did the GOP turn against stimulus? Ask a psychologist. - Ezra Klein - The Washington Post

The bottom line is this: Until quite recently, both parties supported the idea that you combat bad economies with stimulus spending. Now, during an extremely bad economy, the Republican Party has completely abandoned that position. That has left them without plausible solutions — the GOP talks now of things that have very little role in boosting short-term demand, such as deficit reduction and regulatory reform — and has left the Democrats without the votes to pass anything. And that’s left the country deep in the hole.