Arizona officials say they plan to launch a two-track voting system that will bar people who do not present proof of U.S. citizenship from voting in state and local elections. Under a plan unveiled Monday, Arizona will allow people who lack documents proving they are citizens to vote only in federal elections. The move follows a U.S. Supreme Court ruling in June compelling Arizona to accept a federal voter registration form that does not require proof of citizenship. The head of the Arizona Democratic Party said the new plan “tests the boundaries of absurdity” and will create “a group of second-class voters.”