Oklahoma holds a primary (for all partisan office except President) on June 28. Oklahoma does not permit write-ins, and when only one candidate files in any particular race, Oklahoma removes that office from the ballot, whether it is a primary ballot or a general election ballot.

Only two statewide offices are up in Oklahoma this year, U.S. Senate and Corporation Commissioner. Because there is only one Democrat and one Republican running for each of those two offices, those offices are off the major party primary ballots. Republican and Democratic primary ballots will therefore only be printed in areas with a contest between at least two candidates for district or county partisan office. As a result, there is no Democratic primary, and no Republican primary, in most of the precincnts in the state.

But because there are two Libertarians running for U.S. Senate, there will be statewide Libertarian primary. The Libertarian Party allows independents to vote in its primaries. The two U.S. Senate Libertarian candidates are Robert Murphy and Dax Ewbank. Thanks to E. Zachary Knight for this news.