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Senior US Senate Democrat Harkin to retire

A photo dated May 8, 2012 shows US Democratic Senator from Iowa Tom Harkin in Washington, DC. Fifth-term Democratic US Senator Tom Harkin said Saturday he will not seek re-election next year, setting the stage for a key mid-term election that could help RFifth-term Democratic US Senator Tom Harkin said Saturday he will not seek re-election next year, setting the stage for a key mid-term election that could help Republicans retake the Senate.