Democratic senators press X on alleged preferential Polymarket ad treatment
Senator Catherine Cortez Masto and Democratic colleagues sent a letter to X on Sunday, November 2, requesting answers on apparent preferential treatment of Polymarket in its advertising system. The senators raised concern that Donald Trump Jr.'s role as an adviser and investor for Polymarket could create conflicts if X gives the prediction market platform special treatment. Nevada Senator Jacky Rosen joined Cortez Masto in the accusation. The concerns surface as Elon Musk owns X.
Congressional scrutiny of prediction market platforms is hardening into specific accusations tied to political relationships. Kalshi and Polymarket already face a bipartisan Senate probe demanding internal election trading data, and now Democrats are weaponizing platform ad transparency against Polymarket's Trump-world connections. For Polymarket, the accusation creates a dual liability: defending its federal registration while managing reputational damage from perceived partisanship.
Competitors gain leverage if Polymarket becomes synonymous with Republican political access. X must choose between disclosing ad algorithm details or absorbing Senate hearing risk. The letter's timing ahead of midterm markets ensures maximum visibility. Either X produces documents that expose Polymarket's ad terms, or the Senate escalates to subpoena and staff investigation, dragging both into the same spotlight Kalshi and Polymarket already face on trading surveillance.
Joins a sharpened congressional offensive against prediction market platforms that already includes a bipartisan Senate demand for Kalshi and Polymarket's internal election trading data and a Pentagon ban naming both operators.