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The new map would also bring major changes to other districts and would make GOP Rep. Andy Harris’ 1st Congressional District even more Republican leaning by adding many voters from Baltimore, Carroll and Harford counties who were formerly represented by Mr. Bartlett.

Democratic Reps. Chris Van Hollen and Elijah E. Cummings would also inherit some conservative voters from the 6th Congressional District, while Democratic Rep. Donna F. Edwards — whose 4th District currently covers parts of Prince George’s and Montgomery counties — would lose all presence in Montgomery and instead gain part of Anne Arundel County.

The new map is not expected to endanger the Democrats’ chances at re-election, but Mr. O'Donnell predicted that black leaders could be displeased with the changes to Mr. Cummings and Miss Edwards’ districts — the state’s two majority-black congressional districts.

The state National Association for the Advancement of Colored People said this summer they were worried drastic changes to the congressional map could dilute black influence within the districts and throughout the state.

Elbridge James, political action chairman for the NAACP’s Maryland State Conference, said group leaders were still reviewing the map Tuesday afternoon and could have a response Wednesday.