Chief Justice Roberts misplaces an adverb; Obama realizes this, pauses to give him the opportunity to correct the error; Roberts realizes what he has said, corrects himself; Obama nods to acknowledge the correction, smiles, and repeats what Roberts originally said rather than drag things out further.

The text in the Constitution is, “I do solemnly swear (or affirm) 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.”