The tenth in a Boston Globe series discusses partisan control and use of the redistricting process.

There’s no doubt that the redistricting process shifts (and shores up) partisan control of seats.  The article also attributes increasing legislative polarization to the process — though as Brendan Nyhan notes, the political science suggests that party drives ideology (and polarization) a lot more than the composition of a district.  (And it does so with a nod to zombies, no less.)