Martin O'Malley, former governor of Maryland and potential Democratic presidential candidate, pauses while speaking to the media during a Scott County Democratic Party dinner in Davenport, Iowa, U.S., on Friday, March 20, 2015. O'Malley has ruled out a bid for the Senate seat being vacated by retiring Senator Barbara Mikulski and continues to weigh his options for getting into the Democratic presidential race. Photographer: Daniel Acker/Bloomberg via Getty Images
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