§ 26 O.S. § 26-5-118Contests of candidacy

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.