US Chief Justice John Roberts (C, front

File photo of Supreme Court justices. (Mandel Ngan/Getty Images)

File photo of Supreme Court justices. (Mandel Ngan/Getty Images)

US Chief Justice John Roberts (C, front row) poses with fellow justices; (from left front row: Anthony Kennedy, John Paul Stevens, Antonin Scalia, Clarence Thomas, Second row L-R: Samuel Alito, Ruth Bader Ginsburg, Stephen Breyer, and Sonia Sotomayor during a group photo September 29, 2009 at the Supreme Court in Washington, DC. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)