“I, Barack Hussein Obama, 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.”

President Obama twice pronounced those words. On the first occasion, Chief Justice Roberts erred slightly in the wording. So mindful was Obama of the importance of complying with the letter of the law that he arranged for Roberts to administer the oath again the following day. The second time, both spoke the words verbatim.