It was a little like listening to right-wing radio, as one Republican member after another assailed Attorney General Eric Holder for the intrusion of big government into American life, a motivating principle among conservatives that the Obama administration has, with its handling of several issues, unwittingly given new life. A trio of scandals, a contentious nomination, and the generalized hostility that exists between the Republican-led Congress and the attorney general produced several contentious exchanges during Holder’s four hours of testimony Wednesday before the House Judiciary committee.