"High Court strikes down Arizona's proof of citizenship law for voters" 
Det News Jun 17
http://www.detroitnews.com/article/20130617/POLITICS03/306170070/1022/rss10 
"The justices voted 7-2 to throw out Arizona’s voter-approved requirement that prospective voters document their U.S. citizenship in order to use a registration form produced under the federal “Motor Voter” voter registration law."