The single-most buzzed-about moment from Saturday night's Republican presidential debate was Marco Rubio's repetition of a line about Barack Obama that he continued using even after New Jersey Governor Chris Christie busted him on it. On Sunday morning, Rubio returned to the scene of the crime, ABC News, and This Week host George Stephanopoulos led off the interview by asking Rubio "What went wrong" to make Rubio go back to that rehearsed phrase so many times. Rubio took an interesting tack with Stephanopoulos, defending his repetition of the talking point by repeating it three more times: