President Franklin D. Roosevelt/Agriculture Secretary Henry Wallace
vs.
Governer Thomas Dewey/Ambassador Joseph Kennedy
Say that Thomas Dewey is nominated for President by the GOP in 1940 (Dewey was a member of the isolationist wing at the time), and splits his ticket by picking as his running-mate Joseph P. Kennedy (who had just had a falling-out with the Roosevelt administration and was forced to resign as Ambassador to Great Britain). How would this election pan out?
My guess: Dewey 270, Roosevelt 261