Senate Nelson

December 27, 2011 - 9:08 PM
U.S. Sen. Ben Nelson, D-Neb., announces his retirement from the U.S. Senate, Tuesday, Dec. 27, 2011 outside of his home in Omaha, Neb. Nelson said he will retire rather than seek a third term next year, dealing a significant setback to Democratic efforts to maintain control of the chamber. (AP Photo/Dave Weaver)