A ruling Tuesday by the Ninth Circuit Court of Appeals leaves backers of California's Proposition 8 only one more avenue for appeal—the U.S. Supreme Court.

In February, a panel of three judges from the Ninth Circuit ruled that California's ban on same-sex marriage was unconstitutional. Proponents of Proposition 8 then asked for a larger review by 11 of the 25 members of the circuit court; today's vote by a majority of the Ninth Circuit denies reconsideration of the decision.