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Prediction market on polymarket_us. This market will settle to Yes if the 2026 Iowa US Senate election has the smallest margin of victory of any US Senate election held in 2026. Outcome sourced from relevant state election authorities. The margin of victory for each election is the absolute difference in vote share percentages between the candidate that receives the most votes in the election and the candidate that receives the second-most votes in the election. A candidate's vote share percentage will be calculated by dividing the total number of valid votes received by the candidate by the total number of valid votes cast in the election. Where an election is tabulated by ranked-choice or instant-runoff voting, the margin of victory is measured in the final round of tabulation that determines the winner. Where an election includes a potential runoff or second round, the margin of victory is measured in the final round that determines the winner. This market considers all US Senate elections, including special elections, scheduled as of October 31, 2026 to be held in November 2026, including the results of runoff elections held after November 2026. If two or more of those elections have identical smallest margins of victory, Yes contract holders for each tied election receive $1.00 divided by the number of tied elections, rounded down to the nearest tick, per contract.
Resolves: 11/18/2026.