The map of Pennsylvania’s 18 congressional districts is to be in effect for the May 15 primary and substantially overhauls a congressional map widely viewed as among the nation’s most gerrymandered. The map was approved in a 4-3 decision.

Most significantly, the new map likely gives Democrats a better shot at winning seats in Philadelphia’s heavily populated and moderate suburbs, where Republicans had held seats in bizarrely contorted districts, including one labeled “Goofy Kicking Donald Duck.”