Robert Neil Duxbury (March 14, 1934 â June 6, 2016) was an American politician in the state of South Dakota. A member of the Democratic Party, Duxbury was a member of the South Dakota House of Representatives and South Dakota State Senate. He served as minority leader of the House from 1987 to 1994. A farmer and educator, Duxbury attended South Dakota State University and earned a Bachelor of Arts. He served as the South Dakota Secretary of Agriculture from 1973 to 1978. He died on June 16, 2016.