The case with the most promise to deliver a lasting judicial remedy is Whitford v. Gill, from Wisconsin, which advances a fascinating standard called the “efficiency gap.” It is the brainchild of law professor Nicholas Stephanopoulos and political scientist Eric McGhee, but has an elegant simplicity that is easily understandable outside of academia. If gerrymandering is the dark art of wasting the other party’s votes – either by “packing” them into as few districts as possible, or “cracking” them into sizable minorities in many seats – the efficiency gap compares wasted votes that do not contribute to victory.
In November, a panel of federal judges smiled upon this standard and ruled that the state assembly districts drawn by a Republican legislature in the Whitford case represented an unconstitutional partisan gerrymander. “Although Wisconsin’s natural political geography plays some role in the apportionment process, it simply does not explain adequately the sizable disparate” advantage held by Republicans under these new maps, wrote the court.
The judges ordered new state assembly maps in time for the 2018 election – a big deal, considering these district lines have helped give Republicans their largest legislative majorities in several decades, despite years in which Democratic candidates receive more votes. But just as important, it accepted the “efficiency gap” rationale and sent it toward Justice Kennedy. If Kennedy finds it workable, it would become much more difficult for politicians to choose their own voters and rig maps in their favor.