As the FAR right decided to ignore Hitler, FDR was initiating Lend Lease, or perhaps you missed that in your "studies".
That is not exactly how it was.
FDR was pretty much the only who stood up to Congress and the prevailing political view among elected politicians in both parties, but especially in the pro-business pro-eugenics types... that Hitler was the man to back in Europe over the British Empire, which at the time was seen as a threat to the US. At the time, Hitler's policies were closer to the US's own views than that of their "enemy" the British Empire... both economically and socially.
Even among FDRs cabinet there was Hitler supporters who were lobbying FDR not to back the UK up.
Now when I say Hitler supporters.. I dont mean raving NAZI's. The motivation to support Hitler over the UK varied from business (Bush's grandfather for example) to the threat of the British Empire on US aspirations world wide. They simply saw Nazi Germany as the best bet in a war in Europe and the enemy of my enemy... the British Empire.