Martin O'Malley endorses Hillary Clinton for president on May 9, 2007.
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O'Malley flashback: The 2007 Clinton endorsement
In May 2007, then-Gov. Martin O'Malley wholeheartedly endorsed Hillary Clinton for president. Now, he's planning his own presidential run against her.
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Meet Martin O'Malley 19 videos
Martin O'Malley endorses Hillary Clinton for president on May 9, 2007.
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O'Malley flashback: The 2007 Clinton endorsement
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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)
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Sources: Martin O'Malley to suspend campaign
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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)
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Could O'Malley decide the Democratic race?
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O'Malley: Syria no-fly zone could lead to 'escalation'
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Fear and Loathing with Martin O'Malley
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Fear and Loathing with Martin O'Malley
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Martin O'Malley on State of the Union: Full Interview
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O'Malley: DNC stacking deck to help Clinton
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O'Malley: We need to talk issues, not Clinton's emails
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Martin O'Malley: Mistake for Dems to 'circle the wagon'
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O'Malley accuses DNC of stacking deck for Clinton
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O'Malley booed for saying "All lives matter"
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Opening night at the Horseshoe casino, in Baltimore, MD. August 26, 2014.
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Who is Martin O'Malley?
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O'Malley slams Obama for border crises
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O'Malley strikes contrast with Clinton on justice reform
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Democratic Maryland Gov. Martin O'Malley on State of the Union with Candy Crowley
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New Clinton challenger jumping into 2016 race
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Martin O'Malley on Baltimore residents blaming him
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Martin O'Malley in Iowa
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Can this Democrat really beat Hillary Clinton?
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Former Democratic Maryland Governor Martin O'Malley addresses the 2015 International Association of Fire Fighters (IAFF) Alfred K. Whitehead Legislative Conference and Presidential Forum in Washington, D.C., March 10, 2015.
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Martin O'Malley announces presidential run
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