Attorney Theodore Olson, center, shakes hands with Prop. 8 opponents after a news conference at the Federal Building in San Francisco, Thursday, July 2, 2009. Attorneys behind the federal court challenge to California's voter-approved gay marriage ban plan to argue during a pretrial hearing Thursday that by stripping gays of the right to wed, Proposition 8 runs afoul of the constitutional requirement that the government should treat its citizens equally absent a compelling reason not to do so.