Roberts said it in the wrong spot, though. The correct text is “will faithfully execute”. Roberts left out “faithfully” and then tacked it onto the end of the phrase. Obama started to repeat “will execute” and then stopped, realizing “faithfully” was missing.
It’s true that this may have been started by Obama starting to repeat the first phrase “I, Barack Hussein Obama...” before Roberts said “do solemnly swear”, perhaps because there was a small pause there. But the rest of the screwups were Roberts’.
Nope. After Roberts corrected that phrase by moving the word "faithfully" to the front where it should have been, Obambi repeated the phrase with "faithfully" moved back to the wrong place at the end.