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Mr. Harris ousted Democratic Rep. Frank Kratovil Jr. in a 2010 rematch of their race in 2008, after the conservative Mr. Harris had wrested the GOP nomination from then-Rep. Wayne Gilchrest, a moderate who had served nine terms. During redistricting, Maryland lawmakers did not make a major effort to target Mr. Harris, opting instead to pack more Democratic voters into the 8th District represented by 86-year Republican Rep. Roscoe Bartlett.

Maryland has eight seats in the U.S. House of Representatives, and six Democrats and two Republicans now represent the state on Capitol Hill.

Ms. Rosen won a primary race in April by a margin of less than 1 percentage point against John LaFerla.

Ms. Rosen has focused on sustaining local manufacturers and artists. In 1982, she founded the Buyers Market of American Craft – a trade show for North American products and artwork. She later worked for three years for the American Made Alliance, an advocacy organization focused on supporting American artists.