The U.S. Supreme Court’s 2012 decision upholding the Affordable Care Act has legs. Even though the court found the law constitutional, challengers said during a recent discussion of the case at Georgetown University Law Center that it would prove an important weapon in opposing additional expansive exercises of congressional power.

The event, sponsored by George­town’s Supreme Court Institute, brought together many of the key liti­gators on both sides of the contentious battle over the health care reform. The occasion for what amounted to a reunion was publication this month of Unprecedented: The Constitutional Challenge to Obamacare, a book about the case by Josh Blackman, assistant professor at the South Texas College of Law.