This courtroom artist rendering shows Michael Carvin, lead attorney for the petitioners,, right, speaking before the Supreme Court in Washington, Wednesday, March 4, 2015, a the court heard arguments in King v. Burwell, a major test of President Barack Obama’s health overhaul which, if successful, could halt health care premium subsidies in all the states where the federal government runs the insurance marketplaces. Seated, left, from left are, Justice Sonia Sotomayor, Stephen Breyer, Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, Samuel Alito, and Elena Kagan. (AP Photo/Dana Verkouteren)