A federal trial begins on Tuesday in a lawsuit against Wisconsin’s Republican-drawn legislative map, and while it’s not the first such challenge, this one is unique. In some ways, Wisconsin has been here before. Republican legislators drew this map in 2011. Democrats sued, and in 2012, a federal judicial panel left most of the map intact. Under normal circumstances that would be the end of the story. But the case going to trial on Tuesday isn’t normal, and the coalition of groups seeking to overturn the map say Wisconsin’s redistricting experience was anything but typical. “Wisconsin is the most extreme partisan gerrymander in the United States in the post-2010 cycle,” said attorney Gerry Hebert, who’s the executive director of the Washington, D.C.-based Campaign Legal Center. “It’s about as far out from what you would consider to be fair as you can imagine.” Legislatures get a chance to redraw their political districts every decade after the U.S. Census. When state government is divided between Republicans and Democrats, they usually don’t agree on a map and the job falls to a court. When one party runs everything in state government, it can draw the map it wants, which is what happened in 2011.