Duck!" The cry -- from a member of the Capitol Hill press corps -- rang out as Sen. Jim Webb rounded a corner at high noon and strode toward reporters waiting outside the Senate chamber. Webb had called the news conference to talk about his aide, who was caught walking into a Senate building with a loaded pistol and ammo that, the aide said, belonged to the senator. ... "I am a strong supporter of the Second Amendment," he announced, wearing the sort of baggy suit that made it hard to tell for sure if he was packing heat. "I...