Anderson v. King County, Washington Supreme Court, July 26, 2006 [ruling that a statute prohibiting same-sex marriage does not violate the state Constitution]. Excerpt:

The two cases before us require us to decide whether the legislature has the power to limit marriage in Washington State to opposite-sex couples. The state constitution and controlling case law compel us to answer "yes," and we therefore reverse the trial courts. In reaching this conclusion, we have engaged in an exhaustive constitutional inquiry and have deferred to the legislative branch as required by our tri-partite form of government. Our decision accords with the substantial weight of authority from courts considering similar constitutional claims. We see no reason, however, why the legislature or the people acting through the initiative process would be foreclosed from extending the right to marry to gay and lesbian couples in Washington. It is important to note that the court's role is limited to determining the constitutionality of DOMA and that our decision is not based on an independent determination of what we believe the law should be.

Read the majority opinion [PDF text] per Justice Barbara Madsen and a concurring opinion [PDF text] from Chief Justice Johnson as well as dissents from Justices Bridge, Chambers and Fairhurst [PDF texts]. Reported in JURIST's Paper Chase here.