ON THE ROUNDTABLE SUNDAY: As Washington gears up for the upcoming fight over the debt ceiling and contentious confirmation hearings for the president’s cabinet picks, how are both sides positioning themselves politically? What do the president’s nominees tell us about his second-term agenda? What, if anything, can get done in Washington? Our roundtable weighs in: Newark’s Democratic Mayor Cory Booker; Fmr. Gov. Haley Barbour (R-MS); GOP strategist Mike Murphy; and NBC’s Chief Foreign Affairs Correspondent Andrea Mitchell.