True.
The National Organization for Marriage (NOM) has its headquarters in Princeton, New Jersey, but is present all around the country. This non-profit group was established in 2007 to defend heterosexual marriage. Their interstate activity involves campaigning through advertisement, marches, boycotts, and efforts to influence legislation. An example would be their campaign to block the legalization of homosexual marriage in New York, Vermont, New Hampshire, Connecticut, and the District of Columbia.