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Former Maryland Governor Martin O'Malley announces his intention to seek the Democratic presidential nomination during a speech in Federal Hill Park in Baltimore, Maryland, United States, May 30, 2015.  O'Malley, 52, becomes the third candidate to officially bid for the Democratic nomination, joining Hillary Clinton and Senator Bernie Sanders (I-VT).  REUTERS/Jim Bourg   - RTR4Y527 Jim Bourg/Reuters