Okla. Stat. tit. 26, § 26-1-103: Runoff primary election

If at any Primary Election no candidate for the nomination for

office of any political party receives a majority of all votes cast

for all candidates of such party for the office, no candidate shall

be nominated by such party for the office, but the two candidates

receiving the highest number of votes at such election shall be

placed on the official ballot as candidates for such nomination at a

Runoff Primary Election to be held on the fourth Tuesday of August

in the same year. No county, municipality or school district shall

schedule an election on any date during the twenty (20) days

immediately preceding the date of any such Runoff Primary Election.