"Black Republicans" (the term, not the people)

Joshism

Captain
Joined
Apr 30, 2012
Location
Jupiter, FL
Who coined the term "Black Republicans" as a derogatory term for the Republican party? When did it come into use and when did it fall out of use?

Google Ngram will not be of help here I think because it will not distinguish between black Republicans and Black Republicans.
 
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