Next month, the US Supreme Court will hear arguments on California's Proposition 8, which says marriage can only be between a man and a woman. Thursday is the deadline for so-called "friend of the court" briefs, and today's New York Times reports that top Republicans have split with their party platform in support of overturning that law. When California voters passed Proposition 8 by a narrow margin in 2010, it had the support of the state Republican party, including Meg Whitman, Republican nominee for Governor two years later. But Whitman is among the GOP leaders now repudiating their party platform — and House Speaker John Boehner. Sheryl Gay Stolberg reports for the Times.