...Roberts’s historic hand on the scale Thursday was the only way to preserve a central role for private insurers in American health care in the years ahead. In this sense, Roberts’ epic choice is therefore not only small “c” conservative as a matter of judicial temperament but economically conservative to boot. What the chief justice has done is nothing less than save shortsighted partisans bent on overturning Obamacare from themselves. As I and others have long argued, a successful drive to overturn the Affordable Care Act, combined with a continued surge in the ranks of the uninsured, would almost certainly...