Republicans are rushing to redraw congressional districts to their advantage ahead of the midterm elections following a recent U.S. Supreme Court decision that weakened minority protections under the federal Voting Rights Act.

In a matter of just weeks, new U.S. House districts already have been enacted in Tennessee and Alabama and have cleared at least one legislative chamber in Louisiana and South Carolina. But hurdles remain in courthouses and capitols before the new maps can be used in the November elections.