Ladies Home Journal in a joint interview with Barack and Michelle Obama just out in the September issue talks to the presumptive Democratic nominee about what keeps him up at night. During the primary, Clinton talked about who do you want in the White House when the call comes in at 3 a.m.
Barack Obama: "If you were not occasionally jolted awake at three in the morning thinking about the magnitude of the work that has to be done, then you probably shouldn't be president. It's a big job. The thing that keeps me awake at night is not the prospect of losing. It's the prospect of winning and governing."