Maps, maps, and more maps

The fight over congressional districts is entering its most consequential chapter yet.

A sign directs early voters to cast their ballots on the Virginia redistricting referendum. (Photo by Bill Clark/Getty Images)

The redistricting wars continue to be a dominant storyline this midterm cycle, with Democrats notching up a narrow referendum win in Virginia and Republicans preparing to retaliate with a new map in Florida. Weak polling for Pres…