Flipped from RepublicanCalledUnofficial resultsIncumbent defeated
Missouri House District 105
Missouri House of Representatives · Missouri
Cat Clayton flipped the seat for Democrats, winning by 11.1 points over Colin Wellenkamp.
Cat ClaytonDemocrat · winner
55.6%6,616
Colin WellenkampRepublican · incumbent
44.4%5,289
94% of the expected vote counted · 11,905 votes
Source: civicAPI unofficial results and race callsUpdated Nov 7, 2026, 7:01 PM ET
Where the race moved
Against the 2024 presidential vote
The seat's recent races
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Cat Clayton
- 79%
- Colin Wellenkamp
- 21%
- Projected margin
- D+5.9