# Wisconsin Attorney General Prediction Market Enforcement

**Type:** State enforcement action  
**Filed:** April 25, 2026  
**Lead:** Attorney General Josh Kaul (D)  
**Co-Plaintiff:** Oneida Nation of Wisconsin  
**Defendants:** Kalshi, Polymarket, Robinhood, Coinbase, Crypto.com  

## Overview

Wisconsin's prediction market enforcement action is the seventh state lawsuit and the first to incorporate tribal gaming interests as co-plaintiffs rather than amicus parties. The complaint targets five platforms simultaneously—the broadest single-state enforcement action in the series.

## Legal Theories

1. **State gambling law violation** — Standard theory used in prior state suits
2. **IGRA-implied preemption** — Novel theory based on tribal gaming compact exclusivity under Indian Gaming Regulatory Act
3. **Consumer protection violations** — Secondary theory

## Tribal Gaming Dimension

The Oneida Nation of Wisconsin joins as co-plaintiff under theory that prediction markets offering sports event contracts infringe on Class III gaming compact exclusivity granted to Wisconsin tribes under IGRA. This creates a federal law hook for enforcement that operates independently of state gambling classification law and Dodd-Frank preemption arguments.

Wisconsin tribes (Oneida, Ho-Chunk, Lac du Flambeau, Potawatomi, others) have Class III gaming compacts granting exclusivity over specific gaming activities in the state.

## Scope

Complaint targets:
- Sports event contracts
- Political election contracts

Complaint does NOT target:
- On-chain protocols
- Futarchy governance markets
- Decentralized governance mechanisms
- MetaDAO or similar platforms
- Endogenous-price-settled conditional markets

## Political Context

- AG Kaul is Democrat
- Republican-controlled Wisconsin legislature has not opposed lawsuit
- Suggests bipartisan state-level concern about prediction market competition with regulated (tribal and commercial) gaming

## Timeline

- **2026-04-24** — 38-AG Massachusetts amicus filed; CFTC NY lawsuit filed
- **2026-04-25** — Wisconsin AG files suit with Oneida Nation co-plaintiff

## Significance

First state enforcement action to operationalize tribal gaming interests through co-plaintiff structure rather than amicus participation. Creates federal law enforcement pathway through IGRA that could survive even if CFTC wins Dodd-Frank preemption arguments.