Sacramento veteran political cartographer Paul Mitchell drafted the maps that Californians will vote on in November, which would push more liberal voters into five districts currently held by Republican Reps. Kevin Kiley, Ken Calvert, David Valadao, Doug LaMalfa and Darrell Issa.

California lawmakers voted mostly along party lines Thursday to approve legislation calling for the special election. Democratic Gov. Gavin Newsom, who has led the campaign in favor of the map, then quickly signed it — the latest step in a tit-for-tat gerrymandering battle.