Matching DNA samples, scientists and historians have identified first lady Michelle Obama's family history, which traces back to Northern Georgia. According to the New York Times, her ancestors were both slaves and the slave masters because of interracial couplings through the years. Now, Mrs. Obama's distant white relatives, descendants of the slave masters, are grappling with these facts. The bloodlines of Mrs. Obama and Mrs. Tribble extend back to a 200-acre farm that was not far from here. One of their common ancestors was Henry Wells Shields, Mrs. Tribble's great-great-grandfather. He was a farmer and a family man who grew...