Brief for Gun Owners of America, Inc., Gun Owners Justice Foundation, Institute On The Constitution, Center for Media and Democracy, Free Speech Coalition, Inc., Free Speech Defense and Education Fund, Inc., Downsizedc.Org, Downsize DC Foundation, Conservative Legal Defense and Education Fund, Declaration Alliance, Restoring Liberty Action Committee, the Lincoln Institute for Research and Education, Policy Analysis Center, Constitution Party National Committee, and the Libertarian National Committee, Inc., in Support of Respondent

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