Mo. Rev. Stat. § 508.090: Judge disqualified — change of venue granted, when.

1. The judge of a court of record may be disqualified in any civil suit for any of the following causes:

(1) That the judge is interested or prejudiced, or is related to either party, or has been of counsel in the cause;

(2) That the opposite party has an undue influence over the mind of the judge.

2. A change of venue may be awarded in any civil suit to any court of record for any of the following causes:

(1) That the inhabitants of the county are prejudiced against the applicant;

(2) That the opposite party has an undue influence over inhabitants of the county;

but in no case shall more than one change be granted either party.