Republican Sen. Ron Johnson won reelection in 2022 in Wisconsin by just over 25,000 votes — the latest slim-majority victory in the state, which gave its 10 Electoral College votes to former President Donald Trump in 2016 with a victory of 22,000 votes and then flipped to President Joe Biden in 2020, who won the state by around 20,000 votes.

But despite the state’s history of winning elections on the margins, Republicans dominate the state legislature, with 64 Republicans and 35 Democrats in the Wisconsin Assembly. The groundbreaking ruling in late December by the Wisconsin Supreme Court throwing out the GOP-drawn district lines could threaten that control — and change the state’s political landscape.

Though Republicans told the Milwaukee Journal Sentinel that the U.S. Supreme Court will have the “last word” on the matter, now hinting at taking the fight to defend Wisconsin’s electoral maps, which have consistently favored the GOP, to the higher court.