The Thomas More Society is a Chicago-based not-for-profit, national public interest law firm dedicated to restoring respect in law for life, family and religious liberty. For interview requests, contact Tom Ciesielka.

Faith Trust Institute works to educate different types of faith communities about domestic and sexual violence. Contact board President Amy Gopp.

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 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. Press contacts are J.P. Duffy or Alice Chao.

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.