Okla. Stat. tit. 3A, § 209

No pari-mutuel racetrack shall be licensed in any county unless the majority of the voters of said county, voting at an election held for that purpose, approve the conducting of pari-mutuel horse racing in said county. An election shall be called upon the filing of a petition with the county election board containing not less than ten percent (10%) of the qualified voters within any such county. Added by State Question No. 553, Initiative Petition No. 315, adopted at election held Sept. 21, 1982.