Mo. Rev. Stat. § 21.060
Majority necessary to a choice in elections.
21.060. Majority necessary to a choice in elections. — In all elections made by either house, or by joint vote of both houses, the vote of a majority of the members present is necessary to a choice. When an election is by joint vote, the president of the senate shall grant the person elected a certificate, which, in all cases where a commission is required, is sufficient to authorize the granting of a commission.
(RSMo 1939 § 12889, A.L. 1957 p. 595) Prior revisions: 1929 § 11264; 1919 § 7146; 1909 § 8142