Hillary Clinton, shown here boarding a plane in Prague earlier this month, is preparing to step aside soon as secretary of state. She hasn't said what she plans to do next. Kevin Lamarque/AP hide caption

itoggle caption Kevin Lamarque/AP

U.S. Sen. John Kerry (left), who was nominated Friday to be secretary of state, is shown shaking hands with Pakistani Prime Minister Yousuf Raza Gilani during a trip to Pakistan last year. Aamir Qureshi/AFP/Getty Images hide caption

itoggle caption Aamir Qureshi/AFP/Getty Images