bob orr has the latest. the supreme court lifts a long-standing restriction on political contributions. jan crawford and bob schieffer on a game-changing ruling. g.m.'s deadly defect. jeff glor is there as senats accused the carwaker of a cover-up. >> i, for the life of me, can't understand why he still has his job. >> pelley: a huge earthquake in the ring of fire. vincente arenas has the latest on the casualties and damage in chili. and elaine quijano in boston, an ocean of blue, a sea of tears for fire lieutenant edward walsh, husband, father, hero. >> he was destined to do great things, and he did. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. this is our western edition. tonight, the president says he is heartbroken. the secretary of defense calls it a terrible tragedy. at least four people are dead, many others wounded, after a soldier opened fire at fort hood, texas, late today. the gunman is among the dead. it is the second mass shooting by a soldier at the huge army post in less than five years. in chicago, a short time ago, president