John Podesta will step down as president of the Center for American Progress, an official at the organization said today. Podesta, who served as Bill Clinton’s last chief of staff from 1998 to 2001, founded the center in 2003 with a core of wealthy liberal supporters and transformed it into the Democratic Party’s key policy and politics shop.Podesta, 62, will remain the center’s chairman, and will also serve Secretary of State Hillary Clinton as a day-a-week volunteer, the CAP official said, but is not immediately expected to take on any other public role....Podesta will serve as an "expert consultant" to...