Any candidate, hereafter referred to as petitioner, may contest the candidacy of any other candidate for the same office, hereafter referred to as contestee, by filing a written petition with the secretary of the election board with whom said candidate filed the declaration of candidacy. In the event only one candidate files for an office, a petition contesting the candidacy may be filed by any registered voter who is eligible to vote for the candidate.
Okla. Stat. tit. 26, § 5-118