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Markwayne Mullin wins GOP nomination in Oklahoma Senate runoffTrump-backed candidate Rep. Markwayne Mullin has won the Republican primary for the open Senate seat in Oklahoma.Mullin now advances to the general election in November for a final showdown against his Democratic opponent, Kendra Horn.The Senate seat became vacant after longtime GOP Sen. Jim Inhofe announced his retirement earlier this year.The race was called by The Associated Press.