Susan Clark (left) argues with another protester about the Affordable Care Act outside the U.S. Supreme Court. Chief Justice John Roberts likened the law's Medicaid expansion provision to "a gun to the head" of states. Kris Connor/Getty Images hide caption

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Since the Supreme Court's health care ruling, there's been a lot of speculation about whether Chief Justice John Roberts changed his mind during the course of deliberations. Pablo Martinez Monsivais/AP hide caption

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The U.S. Supreme Court justices (first row, from left) Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, (back row) Sonia Sotomayor, Stephen Breyer, Samuel Alito and Elena Kagan — pose at the Supreme Court in 2010. 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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The U.S. Supreme Court justices — (first row, from left) Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, (back row) Sonia Sotomayor, Stephen Breyer, Samuel Alito and Elena Kagan — pose at the Supreme Court in 2010. Chip Somodevilla/Getty Images hide caption

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The U.S. Supreme Court on the eve of a hearing about the Florida presidential election recount, Nov. 30, 2000. The justices later ruled 5-4 in the case of Bush v. Gore, effectively deciding the outcome of the presidential race. Alex Wong/Getty Images hide caption

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Protesters stand outside the U.S. Supreme Court on Thursday. The court's ruling upholding the federal health care law is expected to have wide-reaching implications for businesses. Kris Connor/Getty Images 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

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Todd Long, a conservative activist, is running for the GOP nomination in Florida's 9th Congressional District. Art Silverman/NPR hide caption

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This artist's rendering shows Chief Justice John Roberts (center) speaking at the Supreme Court on Thursday. From left are Justices Sonia Sotomayor, Stephen Breyer, Clarence Thomas, Antonin Scalia, Roberts, Anthony Kennedy, Ruth Bader Ginsburg, Samuel Alito and Elena Kagan. The court voted 5-4 to uphold President Obama's health care law. Dana Verkouteren/AP hide caption

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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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