When the U.S. Supreme Court made a Medicaid expansion optional under the Affordable Care Act, the decision lowered the estimated cost of the law. Chip Somodevilla/Getty Images hide caption

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Joy Reynolds of San Diego, Calif., looks over Friday's front pages on display at the Newseum in Washington, the day after the Supreme Court ruling on President Barack Obama's health care law. David Goldman/AP hide caption

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Protesters and supporters of President Obama's health care law await the Supreme Court's ruling Thursday. The court ruled to uphold the law. The focus now shifts to the states, which are responsible for the lion's share of getting people without insurance covered. Kevin Dietsch/UPI /Landov hide caption

itoggle caption Kevin Dietsch/UPI /Landov

Kailash Sundaran (left), Devyn Greenberg and Devontae Freeland celebrate the Supreme Court's ruling upholding the Affordable Health Care Act outside the court Thursday. Alex Wong/Getty Images hide caption

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When the U.S. Supreme Court rules Thursday on the constitutionality of the Affordable Care Act, it will also rule on whether the expansion of Medicaid is an unconstitutional infringement of states' rights. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

Deb Waldin testifies about her experience with a debt collector at a Minnesota hospital during a hearing led by Sen. Al Franken in St. Paul, Minn., in late May. Minnesota Public Radio/Jeffrey Thompson hide caption

itoggle caption Minnesota Public Radio/Jeffrey Thompson