"It all started in 2011, when Jonathan H. Adler, a conservative law professor at Case Western Reserve University in Ohio, shot an email to his friend Michael Cannon, a health policy expert at the libertarian Cato Institute in Washington, D.C. Adler thought he had spotted an error in Obamacare that could unravel a significant portion of the law." "At issue are the federal subsidies for individuals buying insurance in their state’s health care exchanges. The law stipulates that those subsidies should be allotted for plans purchased “through an Exchangeestablished by the State under Section 1311” (italics added), a reference to the section of the law that establishes state-run exchanges." "Adler wondered: Did the law provide subsidies for only state-run exchanges and not federal ones? The law requires that the federal government step in to create an exchange when a state declines to do so. But does it fail to give subsidies to the residents of those states? "It may seem like a small problem, but if true, it spells disaster for the Affordable Care Act."