By Geoffrey Dickens | February 8, 2012 | 9:45 AM EST

Deaths, guns, whistle-blowers and the highest law officer in the land stonewalling a congressional investigation are the juicy ingredients of a story network news reporters would love to cover – if a Republican were in office. However, when Attorney General Eric Holder testified on Thursday (February 2) before a House oversight committee investigating Operation Fast and Furious, the news was completely ignored by NBC and ABC (there was one full story on Friday’s CBS This Morning). The virtual blackout of Holder’s testimony continues an overall trend of ABC and NBC burying one of the Obama administration’s biggest scandals, despite continual coverage by their competitors at CBS, CNN and Fox News.

MRC analysts reviewed the Big Three network evening and morning news shows and found that while CBS aired 29 stories and 1 brief on Fast and Furious, ABC aired only one brief on the June 15, 2011 edition of Good Morning America. That was still better than what NBC did on their morning and evening news programs, as the gunwalking story has never been mentioned on either NBC Nightly News or the Today show. NBC’s Miguel Almaguer, in a report primarily about a Mexican mother accusing border patrol agents of killing her 17-year old son as he tried to scale a wall, did note that “In December, Border Patrol Agent Brian Terry was killed in a shootout with bandits.” However, Almaguer never tied the Terry killing back to the gunwalking scandal.