Quote Democrats' racism. There's plenty of it available, going way back:
Leuchtenburg, a University of North Carolina professor, is writing a book on Truman.
In 1911, the year he turned 27, Truman wrote to his future wife, Bess: "I think one man is just as good as another so long as he's honest and decent and not a ****** or a Chinaman. Uncle Will says that the Lord made a white man from dust, a ****** from mud, then He threw up what was left and it came down a Chinaman."
"(Uncle Will) does hate Chinese and Japs," Truman continued. "So do I. It is race prejudice, I guess. But I am strongly of the opinion Negroes ought to be in Africa, yellow men in Asia and white men in Europe and America."
More than 25 years later, Truman, then a U.S. senator from Missouri, wrote a letter to his daughter describing waiters at The White House as "an army of coons." In a letter to his wife in 1939 he referred to "****** picnic day."