ANNAPOLIS — The Maryland Senate approved Gov. Martin O’Malley’s controversial congressional redistricting plan Tuesday, despite cries from members of both parties that the map disenfranchises large portions of the state’s population. The bill passed 33 to 13, with all 12 of the Senate’s Republicans voting against it.

Those representing the majority said the map is a well-thought-out way to create strong districts for a state whose demographics have changed significantly since the districts were drawn a decade ago.