Is the Supreme Court about to cause great political upheaval by getting into the business of policing the worst partisan gerrymanders? Signs from last week suggest that it well might.

At the very beginning of its term back in October, the court heard oral arguments in Gill vs. Whitford, a case challenging Wisconsin’s plan for drawing districts for its state Assembly. Republican legislators drew the lines to give them a great advantage in these elections. Even when Democrats won more than a majority of votes cast in the Assembly elections, Republicans controlled about 60% of the seats.