Michael Shull never imagined that a Democrat from the wealthy suburbs of Washington would represent his community in Congress. His corner of Virginia, with its sprawling farms and winding country roads, has been electing Republicans for more than three decades. Then came an unusual nationwide redistricting battle , with Democrats and Republicans redrawing congressional lines to boost their chances in November’s midterm elections. Virginia could be next as voters consider a new map that would pair conservative rural areas with liberal suburbs, diluting Republicans’ electoral clout. “Politicians should be elected to be their people’s voice,” said Shull, a Republican member of Augusta County’s board of supervisors. “Not their party’s voice.” The vote on the constitutional amendment is on April 21, and early balloting has begun. If voters pass the referendum and it survives a court challenge , Shull’s area within the county would be split between the 7th and 9th Congressional Districts.…