I do solemnly swear that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States.
I loved how Obama stopped and smirked at "execute" realizing that Roberts messed up. I also didn't like the "So help me God?" at the end there. The presidents traditionally just tag that on but it's not part of the actual oath and Roberts shouldn't have asked the question (though the justices in the past have said it).