Supreme Court Justice Antonin Scalia spoke with NPR on Tuesday at the Supreme Court in Washington, D.C. Kainaz Amaria/NPR hide caption

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Justice Antonin Scalia testifies before the Senate Judiciary Committee on Oct. 5, 2011. Alex Wong/Getty Images hide caption

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The U.S. Supreme Court took on a number of high-profile cases this term, including the decision to uphold the Affordable Care Act. Chip Somodevilla/Getty Images hide caption

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Judge Richard Posner of the 7th U.S. Circuit Court of Appeals in Chicago. John Gress/Reuters /Landov 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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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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Former pitcher Roger Clemens, center, and his attorneys Rusty Hardin, right, and Michael Attanasio arrive on the courthouse steps after Clemens was found not guilty on all charges in his perjury trial at U.S. District Court in Washington, D.C., on Monday. Saul Loeb/AFP/Getty Images hide caption

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Former pitcher Roger Clemens leaves a federal court in Washington, D.C., on Tuesday. His fate is in the hands of a jury that will decide whether the former pitcher lied about his use of performance-enhancing drugs. Manuel Balce Ceneta/AP hide caption

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For more than 200 years, the Supreme Court has interpreted the meaning of the Commerce Clause of the Constitution. Its latest test is the case challenging the Obama health care law. Mark Wilson/Getty Images hide caption

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