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Today the Supreme Court overturned an Arizona law requiring would-be voters to show proof of citizenship. Writing for a 7-2 majority in Arizona v. Inter Tribal Council, Justice Antonin Scalia wrote that the Arizona statute was preempted by the 1993 National Voter Registration Act that mandates a federal voter registration form for use in all states. Three other states have and 12 other states were considering similar laws. Was this decision a Pyrrhic victory that ultimately gives states sole authority over who can vote?