Virginia is set to argue before the Supreme Court tomorrow their redistricting plan for the second time since the House of Delegates redrew their electoral map following the 2010 census. The map drawn up by the legislature included 12 districts with 55 percent majority blacks.
Those that oppose the redistricting plan have declared that black votes were over-concentrated into too few districts, thus guaranteeing republicans won more state seats. On the other hand is the Voting Rights Act which might have been violated if it were found that the new map diluted the black votes by spreading them so thinly that they were unable to elect black candidates (i.e. democrats). More Here and Here