Judith Apter Klinghofer compares  the story Obama has been telling about his "typical white" grandmother with the stories he told in his book about his grandparents.  There is ample evidence from his own hand that both grandparents were not shy about confronting racism within the white (and since this was Hawaii, probably also the Asian-American) community. All of which makes Obama's failure to confront the black racism of his spiritual mentor a more conspicuous moral failure.