Supreme Court Justice Ruth Bader Ginsburg says a case dealing with how far political parties can go to draw election districts to their benefit might be the “most important” the court will hear next term.

Ginsburg made the comments at a Duke Law School event Friday while referring to Gill v. Whitford, a case in which plaintiffs are challenging Wisconsin’s 2011 map for the state assembly as unconstitutional. A panel of three federal judges ruled 2-1 last year the Republican-drawn map violated the constitution. After the redistricting, Republicans won 48.6 percent of the vote in 2012, but triumphed in 60 of the state’s 99 electoral districts.