Same-sex marriage has been legally recognized in Washington state since December 6, 2012.
On February 13, 2012, Washington Governor Christine Gregoire signed legislation that established full marriage rights for same-sex couples in the state of Washington. Opponents mounted a challenge that required voters to approve the statute at a referendum, which they did on November 6. The law took effect on December 6, and the first marriages were celebrated on December 9. Within a couple of days, more than 600 same-sex marriage licenses were issued in King County alone.
Previously, in 1998, the state had enacted a Defense of Marriage Act that restricted marriage to different-sex couples, reinforcing its statutes that had been interpreted by a state court in 1974 as imposing the same restriction. Several lawsuits filed in state court challenged the state's marriage laws without success, including one filed in 1971, one of the first such cases in the United States.
In 1997, the Washington legislature, in response to events in Hawaii that suggested that state might legalize same-sex marriage, passed a bill that would define marriage as the union of a man and a woman and deny legal recognition to same-sex marriages established elsewhere. The vote was 63 to 35 in the House and 27 to 19 in the Senate. Governor Gary Locke vetoed the legislation on February 21, calling it "divisive and unnecessary", citing the 1974 state court decision in Singer v. Hara. He wrote in his veto message: "Our overarching principle should be to promote civility, mutual respect and unity. This legislation fails to meet this test." An attempt to override his veto failed in the state Senate on a party-line vote, 26 to 20, when seven Democrats who had originally supported the measure changed their position to support the governor. Though Republicans threatened to put the issue to a popular referendum in November, some of their members thought the issue was not urgent enough to risk a contentious public campaign.
In 1998, the legislature passed the same legislation, the Defense of Marriage Act, and expected the governor to allow it to become law without his signature. Instead, he vetoed it a second time, saying that "Our laws right now prohibit same-gender marriages, and I oppose this legislation because it is trying to make illegal something that is already illegal". Democrats who feared the impact of having the legislation on the November ballot helped override his veto. One Democratic leader in the House said: "I'll vote to override. I'll stand up and say it's a bad bill, but it's even worse to have this issue on the ballot." According to the Seattle Times: "Lawmakers, eager to be done with the controversial issue, rushed the ban through in minutes and dumped it in the governor's lap. Locke's veto came within the hour. Then both houses voted summarily to override the veto. No one could remember the last time a bill was passed, vetoed and overridden within hours–with almost no discussion and no debate."