I'm not sure what it said back then, but it currently reads "mainly known as e e cummings and also E. E. Cummings." So capitalization certainly isn't incorrect, strictly speaking... but it still might be the better way to go.
OK, so this won't affect the "easy" answer, but I think it strange to use "NASCAR" as the clue for A.J. Foyt. Although he did compete in a limited way in NASCAR and with some success, he is much more renowned for his Indycar and sportscar racing career.
I suppose they were "known by their initials" as the quiz title suggests, but they wouldn't fit in with the others. I don't know that anyone called them F.D. Roosevelt or J.F. Kennedy.