A conservative tilt on the Wisconsin Supreme Court has given Republicans victories on voting restrictions, gerrymandered legislative districts and other high-stakes cases in recent years.

Voters now have a chance to tip that balance toward the left, with implications for abortion rights and perhaps the outcome of the 2024 presidential election in one of the nation’s most closely divided political battlegrounds.

Tuesday’s primary will feature two conservatives and two liberals running for the seat of a retiring conservative justice. The top two finishers advancing to the April 4 general election.

The eventual winner will determine whether conservatives maintain the majority on the officially nonpartisan court or it flips to 4-3 liberal control for at least the next two years. The court came within one vote of overturning President Joe Biden’s win in the state in 2020, and both major parties are preparing for another close margin in the 2024 contest.

The Supreme Court election campaign could break national spending records if a conservative and a liberal make it through the primary, with issues such as abortion, the fate of legislative maps, union rights and challenges to election results at stake.

Four of the past six presidential races in Wisconsin have been decided by less than a percentage point, including Donald Trump’s victory in 2016 and Biden’s win in 2020. In 2024, Democrats will try to reelect Sen. Tammy Baldwin and chip into Republican’s hold on six of the state’s eight congressional seats.