Brief for Gun Owners of America, Inc., Gun Owners Foundation, Citizens United, Citizens United Foundation, U.S. Justice Foundation, Arizona State Chapter of the Association of Physicians and Surgeons, Institute on the Constitution, DownsizeDC.org, Inc., Downsize DC Foundation, Campaign for Liberty, Conservative Legal Defense and Education Fund, Policy Analysis Center, the Lincoln Institute for Research and Education, Constitution Party National Committee, and Public Advocate of the United States in Support of Petitioners

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