George McGovern, the longtime US Senator from South Dakota who ran as the Democratic Party candidate for president in 1972, was released on Thursday from a Sioux Falls hospital where he had been admitted for fatigue."I feel good and look forward to returning to work," McGovern said in a statement released by Avera McKennan Hospital & University Health Center. Physicians said McGovern, 89, was doing well and should continue to improve. He was admitted to the hospital two days ago after completing a lecture tour.McGovern served in the US Senate from 1963 to 1981. He made an unsuccessful bid to unseat Republican President Richard Nixon from the White House in 1972 on a platform opposing the Vietnam war.The son of a Methodist minister, he flew a B-24 bomber in Europe during World War Two, earning the Distinguished Flying Cross. He also headed the Food for Peace program during the administration of President John F. Kennedy.