Tulsa Pastor Jackson Lahmeyer, Mark Tedford and Nathan Buttfield are all running for the U.S House seat.
Rep. Kevin Hern got the nomination for the U.S. Senate seat to replace Homeland Secretary MarkWayne Mullin.
The statewide ballot measure on the minimum wage is also up for a vote.
Among the most notable open-seat contests are the primaries to replace term-limited Republican Gov. Kevin Stitt.
Oklahoma Attorney General Gentner Drummond is running against Sen. Mike Mazzei.
Cyndi Munson won the Democratic nomination for governor. Munson is an Oklahoma City native and is the minority leader in the Oklahoma House of Representatives.
Click HERE for election results.
