Markwayne Mullin Wins Special Election in Oklahoma GOP Senate Primary

Rep. Markwayne Mullin (R-OK) walks up the House steps at the Capitol on Friday, March 18,
Bill Clark/CQ-Roll Call, Inc via Getty Images
Katherine Hamilton

Trump-endorsed Rep. Markwayne Mullin (R-OK) scored a landslide victory in the Oklahoma Republican U.S. Senate primary on Tuesday, beating out his special election opponent half an hour after polls closed, the Associated Press projected.

Fifth-term Congressman Mullin received nearly 67 percent of the votes by 9:00 p.m. ET with 41 percent total votes reported, compared to former state lawmaker T.W. Shannon with 33.1 percent, New York Times election data showed.

Mullin and Shannon were competing to snag retiring Sen. James Inhofe’s seat, though Mullin’s highly coveted Trump endorsement likely gave him a major boost with voters. Polling before the special election found that 63 percent of likely Republican voters in Oklahoma are more likely to support a Trump-endorsed candidate, and showed Mullin with a 19-point lead.

Mullin almost snagged the nomination in the June 28 primary, winning about 45 percent of the vote to Shannon’s 17 percent. However, Mullin needed to win 50 percent of the vote to avoid a runoff. Former President Donald Trump subsequently endorsed him in July ahead of the special election.

Mullin will now go against Democrat Kendra Horn in November. Horn served in Congress from 2019 to 2021 but lost to Rep. Stephanie Bice (R-OK) in her reelection campaign in 2020 by about five percentage points, or 13,000 votes. Horn had previously flipped a +11 red district to claim the seat in the 2018 midterms. Notably, the state had not elected a Democrat to the U.S. Senate in more than 30 years, the Associated Press reported.

Mullin announced his campaign in February, giving up his House seat to pursue the open senate seat. Mullin is a lifetime member of the National Rifle Association (NRA) and opposes abortion, according to his website. He also supports completing the southern border wall and has pledged support for the America First agenda. The senate hopeful is married and has six children. He is also the owner of a plumbing company.

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