The high court is set to announce whether it believes that San Francisco Mayor Gavin Newsom exceeded his authority by allowing 3,955 gay couples to get married in the city beginning six months ago. Newsom's daring decision appears doomed to fail, but it's unclear what that would mean for the marriages of couples like Gaffney and Lewis. The court could invalidate the marriages or decide to leave them in legal limbo until it decides the larger issue of whether California's ban on same-sex marriage is constitutional.