By Mr. Curmudgeon:President Obama may have invoked executive privilege to blunt Congressional efforts to learn the truth regarding his administration's Operation Fast and Furious, which put weapons in the hands of Mexican drug cartels, but it didn't stop authorities south of the border from apprehending a killer.Jesus Leonel Sanchez is one of five men accused in the shooting death of U.S. Border Patrol agent Brian Terry in the bleak Arizona desert on a cold December night in 2010. Two weapons recovered at the murder scene were later traced to the Justice Department's deadly gunrunning operation.Robert Heyer, Terry's cousin and the...