Democratic presidential hopeful former Maryland Gov. Martin O'Malley in New Castle, N.H., Saturday, June 13, 2015. (AP Photo/Cheryl Senter) ORG XMIT: otkcs117
Democratic presidential hopeful former Maryland Gov. Martin O'Malley in New Castle, N.H., Saturday, June 13, 2015. (AP Photo/Cheryl Senter) ORG XMIT: otkcs117 (Cheryl Senter / Associated Press)

Martin O'Malley has hired a former Obama campaign adviser to lead his bid for the Democratic presidential nomination, his campaign confirmed Monday.

The former Maryland governor has hired Dave Hamrick as campaign manager, filling the position for the first time since announcing his candidacy in Baltimore at the end of May. Hamrick worked for Obama's 2008 campaign and previously served as political director for the Democratic Congressional Campaign Committee, according to a bio posted on his firm's website.

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O'Malley has maintained an aggressive schedule in early primary states -- he was most recently in Iowa over the weekend -- but polls show he lags behind former Secretary of State Hillary Clinton and Vermont Sen. Bernie Sanders. O'Malley's campaign has been advised by Bill Hyers, who managed New York City Mayor Bill de Blasio's successful campaign in 2013.

Hamrick's decision to join O'Malley's campaign was first reported by The New York Times.

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