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While Democrats largely redrew the Senate map, one of the transplanted districts was moved to the outer D.C. suburbs and the other was to the Lynchburg region — areas that lean Republican but could go to Democrats.

Mrs. Whipple said Democratic candidates have a shot, especially if former Delegate Dick Black wins the GOP primary in the 13th District, which includes parts of Loudoun and Prince William counties. Before losing his seat in 2005, Mr. Black was known as one of the most socially conservative House members.

“Our candidate is probably more in keeping with the feelings of the district in terms of being a moderate person,” she said, referring to Army veteran and small business owner Shawn Mitchell. “Dick Black comes with a lot of history.”