A conservative legal group has taken Wisconsin's brand-new online sports betting law to court, seeking to block Gov. Tony Evers from negotiating the compacts needed to launch it. The Wisconsin Institute for Law & Liberty filed suit in Waukesha County Circuit Court on behalf of two taxpayer organizations, the Brown County Taxpayers Association and Citizens Defending Liberty, asking a judge to declare 2025 Wisconsin Act 247 unconstitutional. The law would let people place mobile sports bets from anywhere in the state, provided the wagers are processed through servers sitting on tribal land.
According to WTMJ, the lawsuit also asks the court to stop state officials from authorizing statewide online sports betting altogether while the case is pending. Act 247 grants Wisconsin's tribal gaming system exclusive statewide mobile betting rights, treating any bet placed on a phone anywhere in the state as if it occurred on tribal land the moment it's processed through a tribal server. Supporters of the law argue that structure keeps it within constitutional bounds because the betting itself is still technically conducted through tribal gaming compacts.
WILL contends the arrangement is a legal fiction that can't get around Wisconsin's constitution. The group argues Act 247 violates both the state and federal constitutions, and separately contends it runs afoul of the equal protection clause. At the core of the challenge is the claim that the law illegally expands gambling far beyond what voters agreed to more than three decades ago.
The 1993 Vote at the Heart of the Fight
Wisconsin voters amended the state constitution's Article IV, Section 24 in April 1993, barring lawmakers from authorizing "gambling in any form" except for narrow carve-outs like bingo, raffles, pari-mutuel on-track betting and the state lottery, according to the State Bar of Wisconsin. WILL's lawsuit leans on that amendment, arguing that expanding tribal gaming into a statewide mobile betting product isn't something the legislature can do on its own without another vote of the people.
Public opinion may be on the plaintiffs' side. A Marquette University Law School poll cited in the case found that 64% of Wisconsinites oppose legalizing online sports betting, per WisPolitics. That gap between what lawmakers passed and what voters say they want is likely to feature heavily as the case moves through Waukesha County.
A Bill That Barely Survived the Legislature
Act 247's path to Evers' desk wasn't smooth. The bill passed the state Senate in March 2026 on a 21-12 vote with bipartisan support and opposition, after being stalled for months in the Assembly, according to the Wisconsin Examiner. Evers signed it into law on April 9, 2026, saying he had "reservations" about the legislation but felt a duty to respect tribal sovereignty. The same report notes he pointed to future state revenue potentially funding mental health and opioid crisis response programs.
Tribal Revenue and the Current State of Betting
Wisconsin's 11 federally recognized tribes paid more than $66 million to the state government in 2024 from existing tribal casino gaming operations, per FOX6 Milwaukee. Sports betting has technically been legal in Wisconsin since 2021, but it's been limited to in-person wagering at tribal casinos and a single geofenced mobile app from the Oneida Nation that only works on tribal land, as SportsHandle reports. Act 247 would be the first time mobile betting works anywhere within Wisconsin's borders.
State Already Fighting Prediction Markets in Court
The lawsuit lands amid a broader crackdown on unregulated online wagering in Wisconsin. Attorney General Josh Kaul filed three state lawsuits in Dane County in April 2026 against online prediction market platforms, alleging companies including Kalshi and Polymarket facilitate illegal sports betting disguised as "event contracts," according to the Wisconsin Examiner. Those cases connect to a wider, multistate effort against prediction-market platforms that Hoodline covered when dozens of states targeted Kalshi.
On July 29, 2026, U.S. District Judge William Griesbach denied a federal petition seeking to block Wisconsin from enforcing its commercial gambling laws against those same online sports event contracts, affirming the state's regulatory authority over sports wagering, per AffPapa. That ruling gives Kaul's office fresh legal footing just as WILL's separate challenge to Act 247 gets underway.
Wisconsin's tribes had pushed hard for the law's implementation, urging Evers to move forward once Act 247 passed. Hoodline previously reported on Potawatomi's push for Evers' signature months before the governor signed the bill. Now it's up to a Waukesha County judge to decide whether the tribal-first mobile betting system the tribes fought for can move forward, or whether Wisconsin voters will have to weigh in themselves.
