Jeffrey Zarrillo (L) and his partner Paul Katami (2nd L) and Sandy Stier (R) and her partner Kristin Perry enter the federal courthouse in San Francisco, California July 2, 2009. The two unmarried, same-sex couples claim in their federal lawsuit that California's Proposition 8 violates the U.S. Constitution. REUTERS/Robert Galbraith (UNITED STATES POLITICS SOCIETY)