The frontrunner for the 1940 GOP presidential nomination was Thomas Dewey, but he was upset at the convention by dark horse Wendell Willkie. What if Dewey had won the nomination and gone on to face Roosevelt in November? Does Dewey do any better than Willkie? At the time Dewey was an isolationist, what would be the impact of a race between a Republican isolationist and a Democratic internationalist? If he loses, does Dewey run again in 1944 or 1948?