Nothing oozes hubris like Barack Obama putting on a humble act. “There’s a point where the vanity burns away and you’ve had your fill of your name in the papers, or big adoring crowds, or the exercise of power,” the president tells historian Doris Kearns Goodwin in an “exit interview” published by Vanity Fair. “And for me that happened fairly quickly.” Since he no longer revels in his own grandeur, he explains, he won’t fall into the trap of making decisions out of ambition or “thirsty” attachment to the prerogatives of high office. Do tell. Five years ago, Obama claimed...