Grist: Maryland Gov. Martin OMalley (D) is nothing like any pop culture stereotype of a politician. Hes not a boyishly charming airhead like George W. Bush or The Simpsons Mayor Quimby, or a blunt, lovable grandpa like Joe Biden or The West Wings Jed Bartlet. Hes not even that much like the fictional politician based partly on him, The Wires Tommy Carcetti, who like OMalley became the unlikely white mayor of majority-black Baltimore. OMalley has none of Carcettis sleazy slickness. OMalley comes...