Democratic presidential candidate, former Maryland Gov. Martin O'Malley, greets supporters during the opening of his Cedar Rapids Field Office, Wednesday, Aug. 5, 2015, in Cedar Rapids, Iowa.
Democratic presidential candidate, former Maryland Gov. Martin O'Malley, greets supporters during the opening of his Cedar Rapids Field Office, Wednesday, Aug. 5, 2015, in Cedar Rapids, Iowa. Charlie Neibergall AP
Democratic presidential candidate, former Maryland Gov. Martin O'Malley, greets supporters during the opening of his Cedar Rapids Field Office, Wednesday, Aug. 5, 2015, in Cedar Rapids, Iowa. Charlie Neibergall AP