Vessey became a member of the
South Dakota Senate in the 1905 and 1907
state legislatures. In January 1908, he was elected president of the senate. He was also the first governor to proclaim Mothers' Day as a public observance. In 1910, Vessey's bid for a second term as governor was threatened by an independent candidate named
George W. Egan. In spite of Egan's popularity with voters, Vessey beat both Egan and former governor
Samuel H. Elrod to receive the Republican nomination. He went on to defeat the Democratic candidate, Chauncey L. Wood, in the general election. After serving his terms, he moved to Pasadena, California where he owned and operated a real estate business. ==Death==