Obama was elected as the 44th President of the United States he was not anointed King Obama the First meaning he does not get to do anything he wants simply because he wants to. Thirteen 9-0 Supreme Court decisions against him is all the proof you need to confirm this.
It takes nothing from the Judicial branch to confirm the President cannot legislate.
There are many lefties on this board that say anything he does is legal unless the court rules otherwise. Of course those are the ones that think the Constitution isn't the supreme law of the land.