National Conference of State Legislatures
Stateline.org Gay Marriage Backgrounder
American Civil Liberties Union
American Family Association
Family Research Center
Focus on the Family
Freedom to Marry
Gay & Lesbian Advocates & Defenders (GLAD)
Heritage Foundation
Human Rights Campaign
Marriage Amendment Project
National Gay and Lesbian Task Force
American Catholic
National Association of Evangelicals
Presbyterian Church USA
Religious Action Center of Reform Judaism
Southern Baptist Convention
The Church of Jesus Christ of Latter-day Saints
The Lutheran Church – Missouri Synod
The Vatican
Union of Orthodox Jewish Congregations
United Methodist Church
United States Conference of Catholic Bishops: Comments on Vatican Statement
United States Conference of Catholic Bishops: Official Statement