observed peak is much broader, starting in the 30s and ending in the 60s. This is likely due to increased interest in polio following the election of Franklin Delano Roosevelt in 1932, as well as the development and deployment of Salk’s polio vaccine in 1952 and Sabin’s oral version in 1962. These confounding factors highli

nson was very different from Harry Truman, but he was, in effect, asking for not a third term for the Democrats but a sixth term — after 20 years of Franklin Delano Roosevelt and Truman. Shortly before the 1952 election, Stevenson wrote to the Oregon Journal that "the thesis `time for a change' is the principal obstacle