In OTL, Franklin Roosevelt planned on stepping down in 1940 in favor of his preferred successor, Harry Hopkins. However, Hopkins' health collapsed and WWII broke out, prompting FDR to run for an unprecedented third term. The POD is that German Conservatives forge a coalition to block the Nazis from power, Poland is never invaded and therefore WWII is butterflied. FDR steps down, but neither can Hopkins run due to his health. Who are the Democratic and Republican nominees in this scenario, and which nominee ultimately wins the Presidency in 1940? The war with Japan still happens in this TL, so the winner might very well go on to be a great President himself...