CalledUnofficial results
Oklahoma House District 12
Oklahoma House of Representatives · Oklahoma
Mark Chapman won re-election by 42.3 points over Tiffany Prater.
Mark ChapmanRepublican · winner · incumbent
71.2%10,538
Tiffany PraterDemocrat
28.9%4,274
50% of the expected vote counted · 14,812 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)
Money in this race
Each line compares the two campaigns on one scale.
Tiffany PraterMark Chapman
$2.3K
Raised by the campaign
$126.1K
$1.2K
Spent by the campaign
$127.8K
Campaign money: Oklahoma Ethics Commission, through Sep 26, 2026; Oklahoma Ethics Commission, through Oct 17, 2026.
Source: Oklahoma Ethics Commission campaign filingsUpdated Sep 26, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Tiffany Prater
- <1%
- Mark Chapman
- >99%
- Projected margin
- R+40.8