A chief critic of ATF's gunwalking operation was reportedly briefed on the program last year --- but didn't object. That's according to unnamed sources speaking to the Washington Post about the classified briefing. The sources said Rep. Darrell Issa (R-CA) was given "highly specific information" in an April 2010 briefing, attended by members of Congress from both parties. The operation called "Fast and Furious" is now under fire by Issa and others for allegedly allowing thousands of assault rifles and other weapons to get into the hands of Mexican drug cartels. CBS News first broke the story in February. "All...