And this “it is reported” is pretty lame. We need citations and evaluation of degree of applicability.
One thing that we do know, is that the party we know today as Democrat was the majority of slavery support. And you know you cannot morally equate “I don’t like my Negro neighbor and wish he’d move” to “I think my Negro neighbor ought to be a slave.”
Certainly. A good source for both: W.E.B. Dubois, "Of Mr. Booker T. Washington and Others" , from The Souls of Black Folk. (1903)