"The facts have a well-known liberal bias," declared Rob Corddry way back in 2004 — and experience keeps vindicating his joke.
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As Chait says, the big Obamacare comeback and the reaction of the right are a very good illustration of the forces at work.
The basic facts here are that after a very slow start due to the healthcare.gov debacle, almost everything has gone right for reform. A huge surge of enrollments more than made up the initially lost ground; the age mix of enrollees has improved; multiple independent surveys have found a substantial drop in the number of Americans without health insurance.
Opponents of Obamacare could respond to these facts by arguing that the whole thing is nonetheless a bad idea, or they could accept that the rollout has gone OK but call for major changes in the program looking forward. What they're actually engaged in, however, is mass denial and conspiracy theorizing strongly reminiscent of their reaction to polls showing Mitt Romney on the way to defeat, or for that matter evidence of climate change. Acceptance of the facts is, well, unacceptable.
Nothing illustrated this better than the reaction to
Ezra Klein's own note about the resignation of Kathleen Sebelius, which was intended as analysis rather than advocacy; Klein simply made the fairly obvious point that the HHS secretary was in effect free to resign now because Obamacare has been turned around and is going well. But Klein's statement was met with a mix of outrage and ridicule on the right; how dare he suggest that the program was succeeding?
Why is it, then, that the right treats statements of fact as proof of liberal bias?
Chait's answer, which I agree is part of the story, is that the liberal and conservative movements are not at all symmetric in their goals. Conservatives want smaller government as an end in itself; liberals don't seek bigger government per se — they want government to achieve certain things, which is quite different.