Former state Sen. Mike Mazzei narrowly won Oklahoma’s GOP gubernatorial primary Tuesday, boosted by President Donald Trump’s endorsement, a significant personal loan and a host of outside money.

His defeat of Oklahoma Attorney General Gentner Drummond on Tuesday is a victory for Republican leaders in the state and Trump, who had endured a recent string of uncharacteristic primary losses, particularly in gubernatorial primaries. The president’s preferred picks for governor in Wyoming, Iowa, Georgia, Minnesota and South Carolina all lost their races, and a trio of Trump-backed House candidates fell in Michigan and Florida earlier this month.

Trump endorsed Mazzei in May, ahead of the state’s open primary, but the race remained competitive. Drummond beat Mazzei by 0.3 percentage points in the first round on June 16, forcing Tuesday’s runoff. And the race was defined by massive levels of self-funding in a historically expensive primary for the state.

Mazzei loaned his campaign $11.6 million, while Drummond loaned himself $3 million, according to campaign finance records. But Mazzei was also aided by outside money: The conservative group Club For Growth spent $8 million on TV ads boosting Mazzei and attacking Drummond, per the tracking firm AdImpact.

Ahead of the runoff, the state senator earned endorsements from Gov. Kevin Stitt and Homeland Security Secretary Markwayne Mullin, who represented Oklahoma in Congress for 13 years.

Mazzei served in the state senate for 12 years before being term-limited in 2016. He joined Stitt’s administration for a year in 2019 as budget secretary. He’s the overwhelming favorite in a general election matchup against Democratic state Rep. Cyndi Munson in a state Trump won by 34 points in 2024.

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