John Podesta was Bill Clinton's White House chief of staff from 1998 to 2001, helping the president survive impeachment. Chip Somodevilla/Getty Images hide caption

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Sen. Elizabeth Warren, a Massachusetts Democrat, is leading a push to increase Social Security benefits. But her whole party is not in agreement on the issue. Jacquelyn Martin/AP hide caption

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To fight hyperpartisanship and redistricting aimed at keeping politicians safe in their district, some states are experimenting with new primary voting systems. Jae C. Hong/AP hide caption

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Demonstrators march toward the U.S. Capitol on Saturday to demand that Congress investigate the National Security Agency's mass surveillance programs. Fang Zhe/Xinhua/Landov hide caption

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