An unlikely figure has thrown his weight and his wallet behind an attack ad in the Pennsylvania governor's race: New York's mayor, Michael Bloomberg. The billionaire mayor put up $500,000 to underwrite a gun-control group's 30-second commercial urging voters to reject Republican candidate Tom Corbett, and to aid the group's efforts in other Pennsylvania races. The anti-Corbett spot, financed via Bloomberg's donation to CeaseFire PA, began airing Monday on network and... (GunPolicy.org)