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January 11 – The government of the state of Coahuila approves a Civil Solidarity Pact ("Pacto Civil de Solidaridad") that permits same sex civil unions statewide.
On September 18, 2004, by a significant margin, the voters of Louisiana approved a state constitutional amendment, Louisiana Constitutional Amendment 1, that banned same-sex marriages and civil unions.
In 2004, public attention focused again on Cheney's sexuality when the Bush administration supported the Federal Marriage Amendment, a proposed amendment to the United States Constitution that would limit marriage to heterosexual couples and also ban civil unions and domestic partnership benefits.
Since 1999, the West Coast states of California, Oregon, Washington, and Nevada have all passed domestic partnership statutes; in contrast, most legislatures in the New England region and New Jersey have preferred the term civil unions.
During the civil unions debate, attorney general Roberto Sánchez Ramos had declared it might be unconstitutional to deny the right of marriage to same-sex couples.
In the early 2000s, Enoé Uranga, an openly lesbian politician and activist, unsuccessfully pushed a bill that would have legalized same-sex civil unions in Mexico City under the name Ley de Sociedades de Convivencia (LSC; "Law for Coexistence Partnerships").
A May 2013 poll by Vanderbilt University survey of Tennessee registered voters found that 49% of Tennessee voters supported the legal recognition of same-sex couples, with 32% supporting same-sex marriage, 17% supporting civil unions but not marriage, 46% favoring no legal recognition, 3% said they don't know, and 2% refused to answer.
Governor John Hickenlooper signed a bill to establish civil unions for same-sex and opposite-sex couples on March 21, 2013.