Martin O'Malley

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Two sides: Maryland Gov. Martin O'Malley has called publicly for President Obama not to send immigrant children back to their home countries but privately urged a White House official not to house them at a site in Maryland. (Associated Press)

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Maryland Gov. Martin O'Malley spent part of his Memorial Day on Monday pickin' and pluckin' his trusty banjo on the streets of Annapolis. (Eye on Annapolis via Twitter)

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New York Sen. Hillary Rodham Clinton speaks about her campaign for the 2008 presidency after being endorsed by Maryland Gov. Martin O'Malley, left, at City Dock in Annapolis, Md., on Wednesday, May 9, 2007. (AP Photo/Kathleen Lange)

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Sen. Hillary Rodham Clinton, D-N.Y., pats Baltimore Mayor Martin O'Malley, left, on the back during a Maryland Democratic Party fundraiser at the University of Maryland on Monday, Sept. 25, 2006, in Adelphi, Md.. (AP Photo/Kevin Wolf)

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** FILE ** In this Jan. 8, 2014, file photo, Maryland Gov. Martin O'Malley speaks during a roundtable interview in Annapolis, Md. (AP Photo/Patrick Semansky, File)

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Maryland Gov. Martin O'Malley speaks with reporters in his office inside the Maryland State House in Annapolis, Md., Monday, April 7, 2014, the final day of the 2014 legislative session. (AP Photo/Patrick Semansky)