It's not enough to remove him from office. Misprison of a felony is itself a crime and deserves criminal prosecution. Doing so under color of authority adds enhancements to the crime and to the penalty. In a just society, anyway.
Expect Brian Terry’s family to file a civil lawsuit against Holder as accessory to murder. But it should be done after Zero is out of office so that he can’t pardon his butt buddie.