Among many legal challenges to the validity of the Affordable Care Act (ACA), is Halbig vs. Burwell. The challenge concerns a passage in the statute, when literally read as worded, makes federal tax credits for insurance programs available only to those enrollees in states that have created a state-designed and operated healthcare exchange. Read as it currently exists, the statute does not allow for such tax credits in states that did not set up their own exchanges, but instead chose to allow residents to purchase insurance through a system created by the federal government. This distinction was part of…