**FILE** Chief Justice John Roberts is seen Oct. 8, 2010, during the group portrait at the Supreme Court building in Washington. (Associated Press)
**FILE** President Obama greets Chief Justice John Roberts on Jan. 27, 2010, before he delivered his State of the Union Address on Capitol Hill in Washington. (Associated Press)
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)
FILE - This Oct. 8, 2010 file photo shows the justices of the U.S. Supreme Court at the Supreme Court in Washington. Seated from left are Associate Justices Clarence Thomas, and Antonin Scalia, Chief Justice John Roberts, Associate Justices Anthony M. Kennedy and Ruth Bader Ginsburg. Standing, from left are Associate Justices Sonia Sotomayor, Stephen Breyer, Samuel Alito Jr., and Elena Kagan. The Supreme Court on Thursday, June 28, 2012, upheld the individual insurance requirement at the heart of President Barack Obama's historic health care overhaul. (AP Photo/Pablo Martinez Monsivais, File)
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)
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)
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)
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)
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)
