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Wisconsin voters on Tuesday approved a constitutional amendment to enshrine the state’s already existing voter ID law into the state Constitution. 

The amendment was approved by 25 points. The Associated Press called the election less than 40 minutes after the polls closed. 

The Republican-authored referendum does not change the law that was already on the books in the state which requires that voters show an approved ID to register to vote and receive a ballot. Republican legislators said the amendment was necessary to protect the statute from being overturned by the state Supreme Court. In recent years, Republicans in the Legislature have increasingly turned to the constitutional amendment process to shape state law without needing the signature of Democratic Gov. Tony Evers. 

Democrats had accused Republicans of including the referendum on the ballot in this election as an effort to boost conservative turnout in the state Supreme Court election. 

Wisconsin’s voter ID law has been on the books for more than a decade. During debate over the law, Republican lawmakers discussed its potential to help the party win elections by suppressing the vote of minority and college-aged people who tend to vote for Democrats. 

Democrats and voting rights groups said the law amounted to a “poll tax.” A 2017 study found that the law kept 17,000 people from the polls in the 2016 election. 

Since its passage, a number of court decisions have adjusted the law, leading the state to ease restrictions and costs for obtaining a photo ID — particularly for people who can’t afford a high cost or don’t have proper documents such as a birth certificate. 

Republicans in Wisconsin and across the country have increasingly focused on photo ID requirements for voting since conspiracy theories about election administration emerged following President Donald Trump’s false claims that he was robbed of victory because of voter fraud in the 2020 presidential campaign.

While the law doesn’t change, the approved language of the amendment gives the Legislature the authority to determine what types of ID qualify as valid for voting purposes. Currently, approved IDs include Wisconsin driver’s licenses and state IDs, U.S. passports, military IDs and certain student IDs.