President Obama won reelection on Tuesday night, granting him another four years in the White House. As he transitions from his first term to his second, the president will likely make some personnel changes. Secretary of State Hillary Clinton has said, repeatedly, that she will retire from her post at the end of 2012, and Treasury Secretary Timothy Geithner is "pretty confident" that he will leave at the end of President Obama's first term. The President will have to replace member of his cabinet, and set new policy priorities for the next four years. Sandy  Berger and Harrison Wellford know a lot about the transition process. Samuel Berger was the National Security Advisor to President Clinton. Harrison Wellford served as White House transition advisor to President Carter, President Clinton, and to President Obama in 2008.