Montana Title 13. Elections § 13-36-101. Grounds for contest of nomination or election to public office

(1) a deliberate, serious, and material violation of any provision of the law relating to nominations or elections has occurred;

(2) the person was not, at the time of the election, eligible to be a candidate for the office;

(3) votes were cast illegally or were counted or canvassed in an erroneous or fraudulent manner.