Personal observation: data makes history much more interesting. FDR's big lead compared to other presidents among them. Quick searching turns up only minimal information on the context surrounding FDR's vetoes (e.g. Wikipedia[1]), but Google has a book hit with a whole chapter that's on-point[2].

[1] https://en.wikipedia.org/wiki/List_of_United_States_presiden... [2] http://books.google.com/books?id=B4cwTEJIUBQC&pg=PA171&#...