Arkansas senator J. William Fulbright was one of the leading internationalists of the post-World War II era, convinced that the responsibilities of war and peace were too grave for America to retreat into the isolationism that marked the end of World War I. First elected to the Senate in 1944, Fulbright was a fervent supporter of international organizations and treaties such as the Marshall and Truman plans, as well as NATO and the United Nations. Fulbright came to national attention in the 1960s as he broke with President Lyndon Johnson's foreign policy, especially on Vietnam. Fulbright became convinced that America's unilateralism was turning the country into an imperialist power. The televising of Fulbright's Senate hearings on Vietnam in 1966 helped catalyze public opinion against the war.