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Not one but two major decisions are expected as soon as Monday from the U.S. Supreme Court. Both could add heat to the fall campaign: the federal health care law and Arizona's immigration law. Here's what's at stake and why it matters.
Since border-state Arizona passed a tough immigration law in 2010, the measure has become the symbol of state and local frustration with federal inaction on immigration reform. Many states and cities have adopted "Arizona-style" laws giving police new powers to demand that people show proof of U.S. citizenship, and more are watching for how the Supreme Court rules on a basic question: How far can state and local governments go before intruding on a federal responsibility?