Must voters have to prove citizenship to register? - Article Photos 4/4

FILE- This March 5, 2009, file photo shows the U.S. Supreme Court building in Washington. The Supreme Court argued Monday, March 18, 2013 over whether states fighting voter fraud and illegal immigration can make people document their U.S. citizenship before allowing them to use a federal voter registration system that was designed to make it easier to vote. (AP Photo/J. Scott Applewhite, File)