The National Rifle Association pressed its case against San Francisco's voter-approved ban on firearm sales and handgun possession in court today, arguing that the ordinance flouts state law by requiring law-abiding residents to surrender their pistols. The city's lawyer countered that a local government is entitled to protect its residents from handgun violence. The hearing ended without Superior Court Judge James Warren ruling on the validity of Proposition H, which was approved by 58 percent of the voters Nov. 8 and was challenged by the NRA, three other organizations and seven gun owners the next day. Warren asked the city...