US Supreme Court Justice Anthony Kennedy on Sunday denied a bid to stop gay marriages in California, one day after opponents of same-sex unions petitioned the high court to re-impose the state's ban, a court spokeswoman said.Kennedy denied the application verbally, spokeswoman Kathy Arberg told Reuters.Supporters of the gay marriage ban known as Proposition 8, which California voters approved in 2008, asked the high court to overrule a 9th US Circuit Court of Appeals order that lifted an injunction barring same-sex unions.