The Hubert Humphrey presidential campaign of 1968 began when Vice President of the United States Hubert Humphrey of Minnesota decided to seek the Democratic Party nomination for President of the United States following the announcement by President Lyndon B. Johnson that he would not seek the party's nomination. Johnson had been stalled by the anti-Vietnam War candidacy of Senator Eugene McCarthy of Minnesota, who along with Senator Robert F. Kennedy of New York, became the main opponents for Humphrey. The contest between the men featured a battle for control of the Democratic Party, and cast Humphrey's "old politics", against the "new politics" of McCarthy and Kennedy. The main cause of the division was the Vietnam War, which intensified during Humphrey's tenure as Vice President and grew increasingly unpopular. Edmund Sixtus "Ed" Muskie (March 28, 1914 – March 26, 1996) was an American politician from Rumford, Maine. He served as Governor of Maine from 1955 to 1959, as a member of the United States Senate from 1959 to 1980, and as Secretary of State under Jimmy Carter from 1980 to 1981. Muskie was the Democratic nominee for Vice President in the 1968 presidential election, and was a candidate for the Democratic nomination for President in 1972. Muskie held the highest office (Secretary of State) by a Polish American in U.S. history, and also is the only Polish American ever nominated by a major party for Vice President.