Tuyen Huynh (R) and his partner Phillip Calvin rally outside a federal court house in support of overturning California's ban on same sex marriages in San Francisco, California, June 16, 2010. The judge weighing the constitutionality of gay marriage in a San Francisco courtroom will ask how weddings between gays and lesbians could undermine marriage between men and women. The case to overturn California's ban on gay marriage, approved by voters in 2008, is based on the argument that it denies equal rights to same-sex couples. But it may turn on whether voters had a legitimate, reasonable reason for their decision or were motivated by discrimination. REUTERS/Kim White (UNITED STATES - Tags: POLITICS CIVIL UNREST)