The 1948 United States presidential election was the 41st quadrennial presidential election. It was held on Tuesday, November 2, 1948. In one of the greatest election upsets in American history, incumbent President Harry S. Truman, the Democratic nominee, defeated heavily-favored Republican Governor Thomas E. Dewey, winning re-election in a four-way contest. Truman was the third president to ascend to the presidency upon his predecessor’s death and be elected to a full term. Truman had ascended to the presidency in April 1945 after the death of Franklin D. Roosevelt. Defeating attempts to drop him from the ticket, Truman won the presidential nomination at the 1948 Democratic National Convention. The Democratic convention's civil rights plank caused a walk-out by several Southern delegates, who launched a third-party "Dixiecrat" ticket led by Governor Strom Thurmond of South Carolina. The Dixiecrats hoped to win enough electoral votes to force a contingent election in the House of Representatives, where they could extract concessions from either Dewey or Truman in exchange for their support. Truman also faced a challenge from his party in the form of former Vice President Henry A. Wallace, who launched the Progressive Party and challenged Truman's confrontational Cold War policies. Dewey, who was the leader of his party's liberal eastern wing and had been the 1944 Republican presidential nominee, defeated Senator Robert A. Taft and other challengers at the 1948 Republican National Convention. This was the first election to have primary and general election debates with Dewey debating Harold Stassen in the Republican primary while Norman Thomas debated Farrell Dobbs in the general election. Truman's feisty campaign style energized his base of traditional Democrats, consisting of most of the white South, as well as labor unions, and Catholic and Jewish voters; he also fared surprisingly well with Midwestern farmers. Dewey ran a low-risk campaign and largely avoided directly criticizing Truman. With the three-way split in the Democratic Party, and with Truman's low approval ratings, Truman was widely considered to be the underdog in the race, and virtually every prediction (with or without public opinion polls) indicated that Dewey would win the election. Defying these predictions, Truman won the election with 303 electoral votes to Dewey's 189. Truman also won 49.6% of the popular vote compared to Dewey's 45.1%, while the third-party candidacies of Thurmond and Wallace each won less than 3% of the popular vote, with Thurmond carrying four southern states. Truman's surprise