The Supreme Court’s decision to hear a case on partisan gerrymandering in Wisconsin is being closely watched in other states, including Pennsylvania, where a lawsuit is challenging the process that gave the state its so-called Goofy Kicking Donald Duck-shaped congressional district.

In the Wisconsin case, the Supreme Court said on Monday that it would consider whether partisan gerrymandering violates the Constitution. The court has never struck down an election map on the grounds that it helped one political party at the expense of another.

The announcement came as several states are still waging legal battles over redistricting, the once-a-decade process of drawing new election districts to reflect population changes — an event typically seized on by whichever party is in power to draw maps that favor its incumbents. Here are some other states with election maps before the courts.