Martin O'Malley Said to Schedule May 30 Announcement on Political Plans

He'd present a challenge to front-runner Hillary Clinton from the left if he formally joins the presidential race.

Potential Democratic presidential candidate and former Maryland Gov. Martin O'Malley (D-MD) greets South Carolina Democrats after speaking at the South Carolinna Democratic Party state convention April 25, 2015 in Columbia, South Carolina.

Photo by Win McNamee/Getty Images

Former Maryland Governor Martin O'Malley will make an announcement about his political plans on May 30 in Baltimore, said two aides who asked not to be identified. 

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