If you think about it, Eric Holder should have directed a complete investigation long ago. His failure to do so is resulting in his current situation. The nations top law enforcement officer cannot be slack in these situations. I'm betting that a number of Democrats will vote him in contempt just to say that they are distancing them from the Obama investigation.
Also, Obama should have vociferously demanded a complete investigation by the Attorney General, since the Attorney General failed to to vociferously do so in the first plans.