Fourteen vice presidents had gone on to become president—Biden would become the fifteenth—so it’s strange to suggest the person Biden chose as his running mate should have had no aspirations in that direction. (Though, come to think of it, other vice presidents were shy, self-effacing characters, with no presidential ambitions of their own. Just look at Lyndon Johnson and Richard Nixon, the very definition of blushing, bashful fellows who positively wilted under any attention.)