By persuading the Court to reject a Commerce Clause rationale for a president’s signature act, the conservative legal insurgency against Obamacare has won a huge victory for the long haul. This victory will help revive a venerable tradition of America’s political culture, that of viewing congressional actions with a skeptical constitutional squint, searching for congruence with the Constitution’s architecture of enumerated powers. By rejecting the Commerce Clause rationale, Thursday’s decision reaffirmed the Constitution’s foundational premise: Enumerated powers are necessarily limited because, as Chief Justice John Marshall said, “the enumeration presupposes something not enumerated.”

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