In 1954, Harriman defeated Republican Senator Irving Ives to become the Governor of New York. He served a single term before his defeat by Nelson Rockefeller in the 1958 election. Harriman unsuccessfully sought the presidential nomination at the 1952 Democratic National Convention and the 1956 Democratic National Convention. Although Harriman had Truman's backing at the 1956 convention, the Democrats nominated Adlai Stevenson II in both elections.