Sen. Jim Webb has dispelled any lingering mystery about it: The pistol involved in the arrest of a top Webb aide was the senator's. "It's my gun," Webb, D-Va., acknowledged in an interview last week. Webb declined again to talk about whether he complies with the District of Columbia handgun ban. Almost six months into his first term, the writer, lawyer and Marine Corps veteran of Vietnam War combat agreed to an interview that touched an array of topics. They ranged from the gun episode, Iraq and presidential politics. Webb disclosed he was invited to the White House on Wednesday...