Chad Griffin is president of the nation’s largest gay advocacy organization, the Human Rights Campaign.

David M. Horowitz is national president of Parents, Families and Friends of Lesbians and Gays. Regional directors are listed here.

Mel White is founder and director of SoulForce, an interfaith group committed to “ending spiritual violence perpetuated by religious policies and teachings against gay, lesbian, bisexual and transgender people.”

E.J. Graff is the author of What is Marriage For?: The Strange Social History of Our Most Intimate Institution (Beacon Press, 2000) and an advocate for same-sex marriage.

Lou Sheldon is chairman of the Traditional Values Coalition, a conservative group that wants a constitutional amendment that would ban same-sex marriage, ban same-sex unions and ban gays from receiving benefits of any such unions.

Beverly LaHaye is founder and chairman of the Concerned Women for America, a conservative group that opposes same-sex marriage.

Maggie Gallagher is president of the Institute for Marriage and Public Policy in Washington. D.C. and a co-author of The Case for Marriage.

Michael Galloway is the chairman of Your Catholic Voice, a conservative Catholic group that supports a constitutional ban on same-sex marriage.

Pastor John C. Hagee is the founder and senior pastor of Cornerstone Church in San Antonio, Texas, and the founder and president of John Hagee Ministries.