In his latest for the New York Times, liberal columnist and star economist Paul Krugman argues that the GOP went "0 for 6" on major predictions of Obamacare's failure, but that they haven't and will not acknowledge the program is working due to rigid ideology and dogmatic anti-government fervor.

Quoting Seneca's famous quote that "to err is human" but "[t]o persist is diabolical," Krugman writes that while it's true that "[e]veryone makes incorrect predictions," the Republicans' ability to be "consistently, grossly wrong" about Obamacare requires "special effort."

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The explanation, Krugman says, is one he's offered many times before: "It’s about politics and ideology, not analysis." Republicans, he writes, simply cannot countenance a world in which Obamacare works — it's too opposite from their ideological and (perhaps more importantly) political interests.

After running through one failed prediction after another from GOP politicians and policy experts, Krugman declares that conservatives' "firm conviction that the government can’t do anything useful" and their "dogmatic belief in public-sector incompetence" has "evidently made rational analysis of policy issues impossible."

Yet while Krugman can't help but laugh at the haplessness of the right, he believes there's reason to see it as, at heart, a profoundly unsettling development, one that could hint at even worse Republican thinking to come:

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