A longtime Democratic activist, Willkie changed his party registration to Republican in late 1939. He did not run in the 1940 presidential primaries, but positioned himself as an acceptable choice for a deadlocked convention. He sought backing from uncommitted delegates, while his supporters—many youthful—enthusiastically promoted his candidacy. As German forces advanced through western Europe in 1940, many Republicans did not wish to nominate an isolationist like Thomas E. Dewey, and turned to Willkie, who was nominated on the sixth ballot over Ohio Senator Robert A. Taft. Willkie's support for aid to Britain removed it as a major factor in his race against Roosevelt, and Willkie also backed the president on a peacetime draft. Both men took more isolationist positions towards the end of the race. Roosevelt won an unprecedented third term, taking 38 of the 48 states.