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Opinion: KBJ's confirmation is one of the beautiful moments MLK describedViewed through the lens of what has changed -- and hasn't -- since Martin Luther King Jr.'s words at Riverside Church 55 years ago this week, Jackson's confirmation represents one aspect of what he that day called a "bitter, but beautiful struggle" for America's soul that he helped to lead during the civil rights era -- a battle that continues to this day, writes Peniel Joseph.