They both flubbed it
Just as a comment to the video down below, and the scores of partisans on both sides (not on this blog) who are making a big deal out of it, the chain of events is such: 1) Obama started repeating the oath before Roberts was finished; 2) Roberts then transposed the word “faithfully”, forgetting it then tacking it onto the end of the sentence; 3) Obama realized the error and stuttered, but was a good sport and recited Roberts’ mistaken version.
Did Roberts cause Obama to stutter? Did Obama’s initial flub cause Roberts to forget the word? Does it matter in the slightest? If anyone should be mocked, it’s Senator Diane Feinstein of California who, moments before, clearly called it the “oaf of office”.