Big lies die slowly. After a claim by the Bureau of Alcohol, Tobacco, Firearms and Explosives that 90% of Mexican drug dealers' military weapons (machine guns, hand grenades and missiles) come from American gun stores was exposed as a lie several months ago, it's back — this time with the imprimatur of the Government Accountability Office.A June 21 CBS "60 Minutes" report by Anderson Cooper was clearly coordinated to coincide with release of the GAO report and a similar one by "activist" Josh Sugarmann. You are likely to soon hear and read that the GAO report commissioned by Rep. Eliot...