Elon Musk, President Donald Trump‘s billionaire backer, has funneled more than $2.6 million and counting into a Wisconsin Supreme Court election that could decide on a case involving Tesla, his electric vehicle company.

The contest that will decide the political tilt of the swing state’s highest court is likely to be the most expensive state court race in U.S. history.

Two years ago, a Wisconsin Supreme Court election became the costliest judicial contest in the country. A liberal judge who had a history of being soft on crime bulldozed her way into a seat on the state’s highest court by openly vowing to protect a woman’s right to choose.

The Republican=backed candidate for Wisconsin Supreme Court race who has received support from Elon Musk says it’s more concerning that his Democratic-supported opponent is benefiting from donations by liberal philanthropist George Soros.

A look at what’s at stake in this year’s state Supreme Court race, which will once again determine the court’s ideological control.