FILE - In this Jan. 29, 2013 file photo, President Barack Obama speaks about immigration at Del Sol High School, in Las Vegas. Obama said the threat of concussions for football players mean that everything possible should be done to improve their safety _ especially players from youth football leagues through college. (AP Photo/Carolyn Kaster, File)

Associated Press
FILE - In this Jan. 29, 2013 file photo, President Barack Obama speaks about immigration at Del Sol High School, in Las Vegas. Obama said the threat of concussions for football players mean that everything possible should be done to improve their safety _ especially players from youth football leagues through college. (AP Photo/Carolyn Kaster, File)
FILE - In this Jan. 29, 2013 file photo, President Barack Obama speaks about immigration at Del Sol High School, in Las Vegas. Obama said the threat of concussions for football players mean that everything possible should be done to improve their safety _ especially players from youth football leagues through college. (AP Photo/Carolyn Kaster, File)
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