If you examine the problems with "Fast and Furious", it doesn't take you long to realize that some serious law breaking was undertaken by the United States government. Not only were laws broken, higher officials either turned their backs on this illegal activity, or were directly involved with the criminal operations. To add insult to injury, the highest officials of the United States government in the justice department are either stonewalling, or directly making an effort to hide information that ties them to the operation.
So, now what? A special prosecutor? It's not looking much like that will happen. Anyway, that's a horse crap excuse for rooting out rotten politicians. Too many of the people that should still be investigated still have their hands in the process. With one lying and the other swearing to it, there's no justice or preservation of the rule of law.
Congress can impeach Eric Holder. Whether their cojones are large enough for this task is the big question. So far, chihauhaus have them beat in that department.