The Republican ticket in 1940 consisted of Wendell Willkie for President and Charles McNary for VP. Both of them died in 1944, so they would not have lived to the end of their term if they had won.Wow, I'd not known that one. Happen to know how did they die?
According to Wikipedia, McNary died after unsuccessful surgery for a brain tumor (he was 69), and Willkie died of heart disease (at 52). Willkie ran for President again in 1944 but withdrew after coming in third in the Wisconsin primary. McNary died Feb. 25, 1944, and Willkie on Oct. 8, 1944.