'Leaders of thought'

"All our great Presidents were leaders of thought at times when certain historic ideas in the life of the nation had to be clarified ... [I]t needs to be reaffirmed at this juncture that the United States is one organic entity, that no interest, no class, no section, is either separate or supreme above the interests of all.” (Franklin D. Roosevelt, 1933, shortly before he became president. Hat tip: Joan Walsh)