OK-01 Republican Primary Result: Mark Tedford Wins

Mark Tedford won the OK-01 Republican primary on June 16, 2026, leading the largest field in the district’s history to settle one of the cycle’s most-watched congressional markets. Tedford’s door-to-door ground game and name recognition as a sitting state representative gave him a decisive edge over a Trump-endorsed rival and nine other challengers.

The market closed with Tedford at 98 percent, a near-unanimous read that the field would consolidate around the frontrunner. No candidate cleared 50 percent on primary night, sending Tedford and pastor Jackson Lahmeyer to an August 25 runoff. The primary result still resolves the question of who topped the field, and the market called it correctly.

What Happened in the OK-01 Republican Primary

Mark Tedford, a state representative from Tulsa’s 69th district, drew 32.2 percent of the vote across an 11-candidate ballot on June 16, 2026. Jackson Lahmeyer finished second with 25.9 percent, backed by a May endorsement from President Donald Trump. Nathan Butterfield came in third at 16 percent, and the remaining eight candidates split the rest of the vote.

The seat opened when incumbent Kevin Hern announced in March 2026 that he would run for U.S. Senate, following Markwayne Mullin’s departure to serve as Secretary of Homeland Security. Hern’s exit created an open seat in the Tulsa-based district and triggered the historic primary field. Tedford’s strong finish as the top vote-getter qualified the YES outcome of the market.

Lahmeyer’s Trump endorsement arrived late in May, after Folds of Honor founder Dan Rooney withdrew following the president’s announcement. The endorsement shifted late momentum toward Lahmeyer but not enough to overtake Tedford’s organizational advantage. Tedford’s campaign held town halls across every community in the district, building a ground operation that held up under late pressure.

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How the Market Called It

The Polymarket market on the OK-01 Republican Primary Winner closed with Tedford at 98 percent. Tedford won the primary vote as the top finisher, and the market’s read was correct. The closing probability reflected strong trader conviction that Tedford would top the field despite the crowded ballot and a late Trump endorsement for Lahmeyer.

The math doesn’t lie: a 98 percent closing price on a race this competitive is a bold statement from the market. Traders read Tedford’s organizational strength and incumbency as a state legislator as durable advantages. The total volume of $165,909 gave that read real weight. The market correctly priced Tedford as the primary winner, even as Lahmeyer’s endorsement created late turbulence.

What Is Next for OK-01

Mark Tedford and Jackson Lahmeyer will face each other in a Republican runoff on August 25, 2026. The winner of that contest will face Democrat John Croisant, who ran unopposed in the Democratic primary, in the November general election. The Tulsa-based seat leans heavily Republican, making the runoff the decisive contest for who represents OK-01 in Washington.

Traders looking for the next live market on this race should track the OK-01 runoff and Oklahoma congressional markets at Lines.com. The broader 2026 House control markets are also active, and the Oklahoma race will feed into overall seat-count projections as August approaches.

LINES RESOLUTION VERDICT

TEDFORD WINS: MARKET CONFIRMED

Mark Tedford topped a historically crowded Republican primary field on the strength of his ground game and legislative profile, and the market had him correctly priced at 98 percent heading into primary night. The result matched the market read without hesitation.