The fate of the Affordable Care Act, and the ability of 8 million Americans to afford health insurance, may depend on two U.S. Supreme Court justices: John Roberts Jr. and Anthony Kennedy.

During arguments March 4 in King v. Burwell, Chief Justice Roberts (left) said very little to show his hand in this latest legal battle over the Affordable Care Act. And Kennedy gave initial hope to ACA supporters, but by the end of the argument the court’s swing justice was back in the “unpredictable” column.