From the looks of that photo, some of “his” ancestors and some of “our” ancestors were on rather friendly terms/sarcasm
I don’t think Holder has any kinship with any Americans, white or black, unless you go back several centuries. His father and his maternal grandparents were born in Barbados, so he is not descended from any American whites or from any black people who were slaves in the United States. He does appear to have some white ancestry but his white ancestors would have been Englishmen (or perhaps Irishmen) living in Barbados.