Ruth Bader Ginsburg

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Sitting on the U.S. Supreme Court are (clockwise from upper left) Associate Justices Sonia Sotomayor, Stephen G. Breyer, Samuel A. Alito Jr., Elena Kagan, Ruth Bader Ginsburg and Anthony M. Kennedy; Chief Justice John G. Roberts Jr.; and Associate Justices Antonin Scalia and Clarence Thomas. (AP Photo/Pablo Martinez Monsivais)

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Supreme Court Justice Ruth Bader Ginsburg has said that the president should not expect a retirement letter from her before 2015. (Associated Press)

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FILE - In this Aug. 3, 2010 file photo, Supreme Court Justice Ruth Bader Ginsburg is photographed in her chambers in Washington. (AP Photo/Alex Brandon, File)