President Obama famously claimed to know more about policy than his policy directors, but he didn’t mention First Lady Michelle Obama, who comprises one half of a “stealth co-presidency” according to a new book on the Obamas.

Michelle Obama practically vetoed the choice of Hillary Clinton serving as vice president. “Do you really want Bill and Hillary just down the hall from you in the White House?” she asked Barack Obama, according to Edward Klein’s The Amateur, who says that a New York State Democratic Party official told him “‘Michelle certainly played a role’ in selecting Joe Biden.”

Justice Sonia Sotomayor owes a debt of gratitude to Mrs. Obama, as well. “The First Lady thought Sotomayor had all those . . . qualities her husband was looking for in an appointee,” Klein quotes “a confidant” as saying. “Barack has always listened to what she has to say.”