IN THE WEEKS BEFORE the Supreme Court decided the fate of the Affordable Care Act, conservatives became increasingly worried that Chief Justice John Roberts was about to lose his nerve. The columnist George Will accused liberals of "put[ting] the squeeze" to Roberts, in the hope that he would "buckle beneath the pressure." Fueling the hyperbole was a familiar fear: that Roberts would join the ranks of conservative apostates on the Court who have turned out to be less than ideologically pure.

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