Hillary Clinton is preparing to leave the Obama administration after four years as secretary of state, earning generally high marks and fueling all kinds of speculation about what she wants to do next.
Her boss, President Obama, has paid tribute to her, calling her "tireless and extraordinary," though illness and a concussion have kept her out of public view for the past two weeks.
"More than 400 travel days, nearly 1 million miles," President Obama proclaimed at a diplomatic reception recently. "These are not frequent flier miles.
