The action comes a day after a federal appeals court declared California's ban on gay marriage unconstitutional, saying it was a violation of the civil rights of gay and lesbian couples.

Washington governor Chris Gregoire, left, and congressman
Jamie Pedersen celebrate the bill's passing.
Photograph: Elaine Thompson/AP

The Washington House of Representatives passed the bill on a 55-43 vote. Supporters in the public viewing galleries stood and cheered as many on the Democratic side of the House floor hugged after the vote.

The state Senate approved the measure last week, and the bill now goes to Democratic Governor Chris Gregoire, who is expected to sign it into law next week.

Gregoire issued a statement after the vote, saying it was "a major step toward completing a long and important journey to end discrimination based on sexual orientation."