House GOP moves to bar lawmaker prediction bets as Polymarket has Newsom 23.85%
Rep. Bryan Steil Targets Congressional Prediction-Market Betting as Polymarket Prices Newsom 23.85% for 2028 Democrats
A U.S. House Republican is moving to curb lawmakers’ use of prediction markets, adding a ban on congressional betting to a broader proposal on stock trading. The push comes as Polymarket traders price the 2028 Democratic presidential nomination race with Gavin Newsom leading at 23.85%.
Key Takeaways
- Polymarket shows Gavin Newsom as the leading 2028 Democratic presidential nominee pick at 23.85% (No 76.15%).
- Traders are watching Washington scrutiny of prediction markets as lawmakers debate restrictions on political and policy betting.
- The market is set to resolve on 2028-11-07, with Polymarket volume at 1,206,935,483.
Rep. Bryan Steil, a Wisconsin Republican, plans to introduce a provision that would bar members of Congress and their families from betting on prediction markets tied to policy, politics and elections. The measure is being added to a pending bill that would ban lawmakers from purchasing new shares of individual stocks, except shares bought with dividends from existing holdings. The stock-trading bill is backed by House Speaker Mike Johnson and President Donald Trump, and Republican lawmakers have said it will receive a House floor vote. Under Steil’s proposal, lawmakers who place bets on events where they have insider knowledge would owe a fee of $2,000 or 10% of the transaction value, whichever is greater, plus any gains. The provision would still allow bets outside politics, such as sports, while the broader House bill would also need Senate passage.
Polymarket Data: $1,206,935,483 Volume and 23.85% Newsom Odds Drive Liquidity in the 2028 Democratic Nominee Market
On Polymarket’s “Democratic Presidential Nominee 2028” contract, Gavin Newsom leads at 23.85% Yes versus 76.15% No, down from 24.85% previously. The next tier prices Jon Ossoff at 9.75% Yes / 90.25% No and Alexandria Ocasio-Cortez at 9.05% Yes / 90.95% No, while Kamala Harris sits at 7.15% Yes / 92.85% No. The market shows a steep drop-off beyond the top names, with Josh Shapiro at 4.95% Yes / 95.05% No and Pete Buttigieg at 4.35% Yes / 95.65% No. Total volume is 1,206,935,483, indicating heavy liquidity despite the top line odds shifting by about 1 percentage point.
Watch for House floor action on the stock-trading bill and whether the Senate advances similar limits, alongside any platform-specific compliance changes that could affect political-market participation ahead of the 2028-11-07 resolution date.
Beyond the 2028 Primary: Other High-Liquidity Polymarket Contracts Traders Are Watching
Beyond the U.S. nomination tape, Polymarket liquidity is also clustering in international politics, where traders are marking probabilities across the next wave of presidential contests. In “Next French Presidential Election,” Jordan Bardella leads at 25.5% on $102,784,028 in volume, while “Brazil Presidential Election” prices Luiz Inácio Lula da Silva at 49.5% with $101,864,023 traded. In Colombia, the “Colombia Presidential Election” contract shows Abelardo de la Espriella at 90.5%, up 1.0 percentage point, on $38,020,975 in volume.
Odds Trend
| Window | Change (pp) |
|---|---|
| 24h | +0.0 |
| 7d | +0.0 |
By the Numbers
- Platform: Polymarket
- Market: Democratic Presidential Nominee 2028
- Contract type: Price strike ladder: each rung has separate Yes/No; Yes means the spot price is above that USD strike at settlement.
- Resolution window: Nov 07, 2028 (UTC)
- Status: Active (open for trading)
- Volume: ~$1,206,935,483
Top strike rungs
| Strike | Yes | No |
|---|---|---|
| Gavin Newsom | 23.9% | 76.2% |
| Jon Ossoff | 9.8% | 90.2% |
| Alexandria Ocasio-Cortez | 9.1% | 91.0% |
| Kamala Harris | 7.2% | 92.8% |
+41 more strikes not shown
Related Markets
- Next French Presidential Election — Jordan Bardella 26%
- Colombia Presidential Election — Abelardo de la Espriella 90%
- Brazil Presidential Election — Luiz Inácio Lula da Silva 50%