The California Supreme Court could rule as early as this week on a lawsuit that seeks to invalidate Proposition 8, court spokeswoman Lynn Holton said today. Meanwhile, more than 40 Democratic state legislators filed a friend of the court brief on behalf of opponents of the gay marriage ban approved last week by California voters. The lawmakers -- including Assembly Speaker Karen Bass, Senate President pro Tem Don Perata and incoming Senate President pro Tem Darrell Steinberg -- maintain the initiative process was improperly used. They say only the Legislature can place a measure before voters that radically revises the...