As we mark one year this week since Border Patrol Agent Brian Terry was shot to death in Arizona -- with guns allowed to drift over the Mexican line found at the scene -- we certainly know much more about Operation Fast and Furious. That's the bad-idea-executed-poorly child of the Bureau of Alcohol, Tobacco, Firearms and Explosives, sanctioned by your own U.S. Justice Department. In addition to Terry's death, another federal agent may have been killed in Mexico by a walked gun, and the case could well have ties to North Texas. What we still don't know -- what Attorney...