Mr. Holder, why did you conceal evidence from Congress?

Since I posted once today positively about Eric Holder trying to do something about gun violence in 1995 in Washington D.C., I guess now it is time to balance the postings. Dick Morris writes today about Holder withholding information from Congress regarding letting go a criminal gun-runner. There is one obvious error in the Morris report, where he cited a date as May 19, 2012, when I think he meant to write March 19, 2012. Anyway, here is the Morris report, with a call for Holder's impeachment: http://dickmorris.rallycongress.com/6417/holder-concealed-evidence-gunrunners-release/