Key facts
- Oklahoma is holding primary elections for US Senate and governor races.
- U.S. Representative Kevin Hern is leading the Republican primary for the open Senate seat.
- The Senate seat was vacated by Homeland Security Secretary Markwayne Mullin.
- The governor's race features multiple candidates, including Attorney General Gentner Drummond and former state Sen. Mike Mazzei.
- A runoff election is possible if no candidate secures over 50% of the vote.
Oklahoma is holding primary elections for open races for the U.S. Senate and governor. U.S. Representative Kevin Hern is leading the Republican primary for the Senate seat vacated by Homeland Security Secretary Markwayne Mullin. President Donald Trump has endorsed Hern. The governor's race is contested by several candidates, including Attorney General Gentner Drummond and former state Sen. Mike Mazzei, who also received a late endorsement from Trump. A runoff election is likely if no candidate in any race secures more than 50% of the vote.