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First, Obama jumped in before the "do solemnly swear" phrase, which seemed to throw the chief justice off his stride. Roberts rendered the next phrase as "that I will execute the office of President to the United States faithfully."
"That I will execute," Obama repeated, then paused like a school teacher prompting his student with a slight nod. Roberts took another shot at it: "The off ... faithfully the pres ... the office of President of the United States."