Brief for Downsize DC Foundation, DownsizeDC.org, Gun Owners Foundation, Gun Owners of America, Inc., U.S. Justice Foundation, National Association for Gun Rights Inc., Center for Media and Democracy, Lincoln Institute for Research and Education, Western Journalism Center, Free Speech Coalition, Free Speech Defense and Education Fund, Abraham Lincoln Foundation, Institute on the Constitution, Conservative Legal Defense and Education Fund, and Policy Analysis Center in Support of Respondent

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