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JOHNSTON, IA - JANUARY 31: Democratic Presidential Candidate Martin O'Malley speaks to potential supporters at a residence on January 31, 2016 in Johnston, Iowa. O'Malley and other candidates are making their final appeals to voters ahead of the Iowa caucus February 1. (Photo by Steve Pope/Getty Images)
JOHNSTON, IA - JANUARY 31: Democratic Presidential Candidate Martin O'Malley speaks to potential supporters at a residence on January 31, 2016 in Johnston, Iowa. O'Malley and other candidates are making their final appeals to voters ahead of the Iowa caucus February 1. (Photo by Steve Pope/Getty Images)

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    Sources: Martin O'Malley to suspend campaign

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Sources: Martin O'Malley to suspend campaign

Martin O'Malley will suspend his presidential campaign on Monday night, sources close to the former Maryland governor told CNN.

Sources: Martin O'Malley to suspend campaign

Martin O'Malley will suspend his presidential campaign on Monday night, sources close to the former Maryland governor told CNN.