Proposition 22 provoked debate long after its passage. In November 2008 California voters overturned the "In re Marriage Cases" decision by approving an amendment of the state constitution called Proposition 8. In June 2010, Proposition 8 was declared unconstitutional by U.S district judge Vaughn Walker based on the Due Process and Equal Protection clauses of the Fourteenth Amendment of the United States Constitution. In June 2013, the United States Supreme Court in "Hollingsworth v. Perry" ruled that the Intervenor-Defendants had no Article III standing to appeal Walker's ruling, keeping Proposition 8 unenforceable throughout California and enabling same-sex marriage to resume just two days after the decision.