The only problem with this is that they have control of the "Justice" department as well and simply would refuse to prosecute.
That is going to last only so much longer. Holder is on the way out, and when the Republicans take back the Senate things will be a great deal different. There is lots of talk about the Democrats losing as many as 12 seats this Fall, and no telling how many more in the Presidential election in 2016 when the real Obamacare backlash will hit. Keep in mind that Harry Reid changed the rules with his "Nuclear Option" and it now only requires a simple majority to pass anything in the US Senate. 51 votes. If things go as predicted then that means the Republicans have enough votes to over-ride any veto that Obama cares to make.
That means that Obama can write an EO, and the Congress can shut him down with legislation, even if he vetoes it. That is something that has not been possible until now. The Democrats had that kind of power during the first 2 years, and Nancy Pelosi squandered it by losing the House Speakership. Republicans will control an even bigger House majority after this Fall as well...no telling how big....
Back on point....depending how these elections go will also determine what goes on over at Just-Us as well. A determined Congress can indeed rein in an ambitious Attorney General if they want to. Having big majorities in both houses of Congress will ensure that happens.