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The courts in recent years have upheld several challenges to state laws that have strengthened rules requiring voters to show identification before casting ballots, including a landmark 6-3 Supreme Court decision in May 2008 that upheld a photo ID requirement in Indiana.

But because the Arizona’s voting requirement centers around proof of citizenship — not just a photo ID — many legal analysts say it’s difficult to guess what the court will decide.

The Supreme Court last month heard oral arguments in a separate case challenging a key provision in the 1965 Voting Rights Act that requires all or parts of 16 states with a history of discrimination in voting to get federal approval before making any changes in the way they hold elections.

The court is expected to announce its decision in both cases in June.

This article is based in part on wire service reports.