Compared to the congressional district maps Maryland lawmakers adopted this fall, Gov. Martin O'Malley's proposal for new legislative district lines looks downright rational. In most instances, the boundaries bear more than a passing resemblance to recognizable communities — Hagerstown, for example, gets its own delegate, Carroll County has its own senator, and the Lower Shore, Middle Shore and Upper Shore are divided in more or less the way you would expect. And there appears to be no obvious attempt here by Democrats to seek partisan advantage. In fact, a Democratic state senator in Baltimore County could be put at risk by the new lines.