Sam Wang oped for WaPo:

But if the Republicans win in the U.S. Supreme Court, the result on a national scale would almost certainly benefit Democrats. Why? Because outside North Carolina, only swing states and blue states have curbed partisan gerrymandering. In Pennsylvania, New York, Connecticut, Minnesota, New Hampshire, Wisconsin and Virginia, this was done through the intervention of governors or voting-rights-minded state courts; in Arizona, California, Michigan and Colorado, citizen initiatives gave redistricting authority to independent commissions.