John St. John was an American politician and a member of the Republican Party. He served as the 18th Governor of Kansas from 1879 to 1883. St. John is known for his strong stance on prohibition and his efforts to promote temperance during his time in office. In addition to his governorship, St. John was also involved in various political and social causes. He ran for the U.S. presidency in 1884 as a candidate for the Prohibition Party, advocating for the banning of alcohol. His legacy includes his influence on the temperance movement in the United States.