One of the dangers of using the Executive Action to accomplish your campaign goals six years after the fact and despite having an agreeable Congress right about the time you could have fulfilled your campaign promises, is that, if the EA survives the endless litigation and bellyaching it's headed for, future Presidents who don't share your inclusive attitude on undocumented workers, and for that matter, on basically anything else, may also use the EA to accomplish their goals.
Fortunately, President Obama has considered that eventuality and has issued an expert opinion on the subject. No, President Rick Santorum will not be allowed to use Executive Action to enact his agenda when Congress fails to heed his advice about scantily-clad ladies of the Internet and the overwhelming corporate tax burden. Why? Because Barack Obama says so.