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

Juan E. Campo is associate professor of religious studies at the University of California, Santa Barbara. He specializes in the comparative study of Islam, particularly in the Middle East and South Asia, and teaches courses on Islamic tradition; religion, politics and society in the Persian Gulf region; Islamic mysticism; and modern Islamic movements.

Glenn Stanton is the director for Family Formation Studies at Focus on the Family in Colorado Springs.

Alameda Islamica is a weblog run by an informal gathering of San Francisco Bay Area Latino Muslims. Their goal is to bring together hispanics with Islamic beliefs and to educate the community about the religion. They post information about gatherings and classes.

Cecilia Elena Rouse is a professor of economics and public affairs and dean of the Woodrow Wilson School of Public and International Affairs at Princeton University.

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.

Clive R. Belfield is associate director of the National Center for the Study of Privatization in Education at Teachers College at Columbia University in New York. He also is an assistant professor of economics at Queens College, City University of New York.

The Islamic Center of Northridge in Northridge, Calif., maintains two local mosques.

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