This artist rendering shows Paul Clement (second from left) with Solicitor General Donald B. Verrilli Jr. (seated, right), addressing the Supreme Court on Wednesday. Justices pictured are (from left) Sonia Sotomayor, Stephen Breyer, Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, Samuel Alito and Elena Kagan. Dana Verkouteren/AP hide caption

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A pro-gay-marriage protester stands in front of the Supreme Court on Tuesday, the first of two days of oral arguments on challenges to laws that limit the definition of marriage to unions of a man and a woman. Karen Bleier/AFP/Getty Images hide caption

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People file into the Supreme Court on Tuesday for the court's hearing on California's Proposition 8, a voter-approved ban on same-sex marriage. Pablo Martinez Monsivais/AP hide caption

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Snow covers flowers in front of the Supreme Court building on Monday in Washington, D.C. On Tuesday, the justices hear oral arguments on the constitutionality of California's Proposition 8, which banned gay marriage. Jonathan Ernst/Reuters /Landov hide caption

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A scene outside the Supreme Court on Monday, as the justices announced they would hear another case involving affirmative action in higher education. Many of those waiting in line at the court in a late-season snowfall were hoping to attend oral arguments on gay-marriage cases being heard Tuesday and Wednesday. Jose Luis Magana/AP hide caption

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The Supreme Court takes up a case Monday about whether brand-name drug manufacturers can pay generic drug manufacturers to keep generics off the market. iStockphoto.com hide caption

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Ken Mehlman, then chairman of the Republican National Committee, speaks during a meeting at the Capitol Hilton in January 2006 in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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Edith Windsor in her New York City apartment in December 2012. Next week, the U.S. Supreme Court hears her challenge to the 1996 Defense of Marriage Act. Richard Drew/AP hide caption

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People stand in line outside the U.S. Supreme Court on Monday. Chip Somodevilla/Getty Images hide caption

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Arizona Attorney General Thomas Horne talks with reporters outside the U.S. Supreme Court after oral arguments in the case challenging Arizona's voter registration law on Monday. Chip Somodevilla/Getty Images hide caption

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A voter fills out her ballot during early voting before the 2012 presidential election at the Gila County Recorder's Office in Globe, Ariz., on Oct. 26. Joshua Lott/Reuters/Landov hide caption

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Chief Justice John Roberts, shown here during a presentation last June in Pennsylvania, questioned the U.S. solicitor general about voting statistics during this week's arguments on Section 5 of the Voting Rights Act. Ann Wilkins/AP hide caption

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The Supreme Court on Wednesday weighs the future of a key provision of the landmark Voting Rights Act. Carolyn Kaster/AP hide caption

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U.S. Supreme Court Police officers stand on the steps in front of the court building in November. Chip Somodevilla/Getty Images hide caption

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