Trader consensus on Polymarket heavily favors U.S. Rep. Randy Feenstra at 58.5% implied probability to win the Iowa Republican gubernatorial primary, driven by his incumbency in the 4th Congressional District, superior fundraising exceeding $1 million early, and endorsements from national GOP figures including Trump allies. Challenger Adam Steen holds 24.5% on grassroots momentum from his state Senate service and anti-establishment appeals, bolstered by a recent internal poll showing him closing the gap post-debate. Zach Lahn trails at 14.1% with local business backing but limited statewide visibility, while minor candidates Brad Sherman and Eddie Andrews linger below 3%. Recent Feenstra campaign finance filings and Steen's viral social media push have stabilized these odds amid the 2026 cycle's early jockeying.
Experimental AI-generated summary referencing Polymarket data · UpdatedRandy Feenstra 50%
Adam Steen 25%
Zach Lahn 14.1%
Brad Sherman 2.5%
Randy Feenstra
58%
Adam Steen
25%
Zach Lahn
14%
Brad Sherman
3%
Eddie Andrews
1%
Randy Feenstra 50%
Adam Steen 25%
Zach Lahn 14.1%
Brad Sherman 2.5%
Randy Feenstra
58%
Adam Steen
25%
Zach Lahn
14%
Brad Sherman
3%
Eddie Andrews
1%
If no 2026 Iowa Gubernatorial Republican Primary takes place, this market will resolve to “Other.”
The resolution source for this market will be the first official announcement of the results from the Iowa Republican Party; however, an overwhelming consensus of credible reporting may suffice.
Market Opened: Dec 9, 2025, 6:04 PM ET
Resolver
0x2F5e3684c...Resolver
0x2F5e3684c...Trader consensus on Polymarket heavily favors U.S. Rep. Randy Feenstra at 58.5% implied probability to win the Iowa Republican gubernatorial primary, driven by his incumbency in the 4th Congressional District, superior fundraising exceeding $1 million early, and endorsements from national GOP figures including Trump allies. Challenger Adam Steen holds 24.5% on grassroots momentum from his state Senate service and anti-establishment appeals, bolstered by a recent internal poll showing him closing the gap post-debate. Zach Lahn trails at 14.1% with local business backing but limited statewide visibility, while minor candidates Brad Sherman and Eddie Andrews linger below 3%. Recent Feenstra campaign finance filings and Steen's viral social media push have stabilized these odds amid the 2026 cycle's early jockeying.
Experimental AI-generated summary referencing Polymarket data · Updated


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