Redistricting math muddles midterms

The redistricting math is getting complicated for both parties ahead of the midterm elections, where the House majority is on the line.   This week has brought good and bad news for both parties: South Carolina’s legislature rejected a GOP map and a federal court blocked Alabama Republicans’ preferred congressional lines, while two judges in Florida and Tennessee tossed out efforts to halt their own Republican-backed maps.   It makes figuring out which party actually has the…