Michael Carvin (right), lead attorney for the petitioners speaking before the Supreme Court in Washington, D.C., on March 4. The justices heard arguments in King v. Burwell.
Online health insurance marketplaces are central parts of the Affordable Care Act. And HealthCare.gov, the federally run exchange, is where 27-year-old Kathryn Ryan, a restaurant server in Philadelphia, turned for health coverage, as soon as the law took effect.
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