A Marquette University Law School poll taken in late February also found that a majority of registered voters in Wisconsin support photo ID for voting, and separately, a majority of registered voters in Wisconsin said they would support the ballot initiative.

The most expensive judicial contest in U.S. history will determine whether conservatives can topple the 4-3 liberal majority that has controlled the court for the past two years.

Tuesday’s election to fill a Supreme Court seat in Wisconsin has emerged as the country’s first major political battle since President Donald Trump returned to the White House. It offers both an early test of the president’s popularity in a state he narrowly flipped last year and a gauge of the political machine that Trump ally Elon Musk has deployed to drive up turnout in this swing state.