(CNN) -- A federal judge in California has knocked down the state's voter-approved ban on same-sex marriage, ruling Wednesday that the state's controversial Proposition 8 violates the U.S. Constitution.
Chief U.S. District Judge Vaughn Walker found in his ruling that the ban violated the Constitution's equal protection clause under the 14th Amendment.
The closely watched case came some two years after Californians voted to pass Proposition 8, which defined marriage as a union between a man and a woman.
Neither opponents nor supporters of same-sex marriage said before the ruling that it would likely be the last. Both sides said the decision will be appealed and eventually wind up in the U.S. Supreme Court.