The first lady seems bitter that the voters, like rebellious teens, aren’t taking the Obamas’ advice anymore. Last month, Michelle Obama sat down with Oprah Winfrey for what many assumed would be one of those feel-good, lighthearted interviews. Past first ladies have provided similar end-of-term interviews, in which they tend to display both astonishment and relief that it’s all over, coupled with the proper magnanimity and graciousness toward the next family to reside in the White House. Yet, this time was different. Far from feel-good, Mrs. Obama seemed more like a frustrated mother lamenting the rebelliousness of her growing child....