We have a standard for judging partisan gerrymandering. The Supreme Court should use it.

In his farewell address to the nation, then-President Barack Obama called for an end to partisan gerrymandering, saying that congressional districts should be drawn “to cater to common sense and not rigid extremes.” After his presidency, Obama will work with former attorney general Eric Holder, who will lead the National Democratic Redistricting Initiative, a group established to challenge Republican-drawn district maps in the courts.

One obstacle is that the Supreme Court has yet to recognize a discernible and manageable standard for identifying unconstitutional partisan gerrymanders. In our recent book, “Gerrymandering in America,” we show that there is indeed a standard to judge these cases that can be directly derived from the Constitution (Monkey Cage article by Anthony J. McGann, Charles Anthony Smith, Michael Latner and Alex Keena)