The LGBT Humanist Council is a project of the American Humanist Association. It provides support to LGBT humanists in coming out and serves as a forum for exchanging ideas.

The Center for Health and Gender Equity in Takoma Park, Md., monitors “the effects of U.S. international policies on the health and rights of women, girls, and other vulnerable populations in Africa, Asia, and Latin America.”

Citizens for a Responsible Curriculum formed in Montgomery County, Md., out of concern for how sexual orientation was presented in the public school sex education curriculum.

The National Organization for Marriage lists its mission as “to protect marriage and the faith communities that sustain it.”

The Institute for Marriage and Public Policy, based in Manassas, Va., posts research briefs on marriage-related topics. The institute also hosts a Marriage Debate blog.

The Family Research Council is a Christian organization promoting the traditional family unit and the Judeo-Christian value system upon which it is built.

The Alliance for Marriage has pushed for a constitutional amendment banning same-sex marriages nationwide.

The Alliance Defense Fund opposes same-sex marriage and efforts to circumvent DOMA.

The United for Marriage Coalition is an umbrella group advocating for marriage rights for gays and lesbians. Faith groups (and nontheist organizations) are among the group’s members.