Stephanie Bice won a G.O.P. runoff to challenge the only Democrat in Oklahoma’s congressional delegation.

Stephanie Bice, an Oklahoma state legislator, won the Republican primary on Tuesday to challenge Representative Kendra Horn, the lone Democrat in the Oklahoma delegation.

Ms. Horn was perhaps the most surprising victor in the 2018 elections, winning by just over 3,300 votes and flipping the seat for the first time since the 1970s.

Nine Republicans had sought the chance to challenge Ms. Horn, sending the race into a runoff. Ms. Bice defeated Terry Neese, an entrepreneur who had closely tied herself to President Trump, for the chance at the seat.

“Kendra Horn promised to be a moderate but has been nothing but a rubber stamp for Nancy Pelosi and the socialist agenda of House Democrats,” said Representative Tom Emmer, the chair of the House Republican campaign arm. “Horn will be rejected by voters in November and I look forward to welcoming Stephanie to Congress.”

Representative Cheri Bustos of Illinois, the chairwoman of the House Democratic campaign arm, said that she had no doubt that Ms. Horn would be re-elected.

“Representative Kendra Horn has proven to be an effective leader for her community, working tirelessly to lower the cost of prescription drugs and get Oklahomans back to work safely,” she said.

The race is considered a tossup by most political handicappers, including the Cook Political Report.

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