I just cannot get past the notion that the fact that Martin Luther King was a clergyperson was integral to his mission and historical persona. There is power in that robe, in the calling and the ordination, and we forget just what drove Dr. King at our own risk. King was a Christian pastor, who preached and lived out of Christian scriptures. His message of reconciliation and justice was a deeply Biblical one.
Incidentally, I am pretty sure he read the same Bible as the rest of us.
Lest this read as some call to repentance for the Christian church, let me simply say that it is.