Hillary Clinton
Opposes same-sex marriage but supports civil unions. Says states should ultimately decide the issue. Opposes a constitutional amendment banning same-sex marriage.

Mike Huckabee
Opposes same-sex marriage.

Chris Dodd
Opposes a constitutional amendment banning same-sex marriage.

Duncan Hunter
Opposes same-sex marriage and supports a constitutional amendment defining marriage as a union between one man and one woman.

John Edwards
Opposes same-sex marriage. Opposes a constitutional amendment banning same-sex marriage.

John McCain
Supports definition of marriage as a union between a man and a woman, but opposes a constitutional amendment banning same-sex marriage. Says individual states should decide the issue. Says a federal marriage ban might be appropriate if courts overturned state marriage laws. Supports legal benefits for same-sex partners.

Mike Gravel
Supports same-sex marriage.

Ron Paul
Supports definition of marriage as between a man and a woman, but opposes any federal marriage definition. Says that states should not be forced to recognize another state's same-sex marriage law. Opposed House measure amending the Constitution to ban same-sex marriage.

Dennis Kucinich
Supports same-sex marriage. Opposes constitutional amendment banning same-sex marriage.

Mitt Romney
Opposes same-sex marriage. Opposes civil unions, though had supported a Vermont-style civil unions law for Massachusetts.

Barack Obama
Opposes same-sex marriage, but also opposes a constitutional ban. Supports civil unions.

Tom Tancredo
Co-sponsored legislation that would ban same-sex marriage nationwide.

Bill Richardson
Opposes same-sex marriage but supports legal rights and benefits for same-sex partners. Voted for the Defense of Marriage Act in Congress.

Fred Thompson
Opposes same-sex marriage. Personally opposes civil unions, but says the issue should be left to states.