The Rev. Joseph E. Lowery fought to end segregation, lived to see the election of the country’s first black president and echoed the call for “justice to roll down like waters and righteousness like a mighty stream” in America. For more than four decades after the death of his friend and civil rights icon, the Rev. Martin Luther King Jr., the fiery Alabama preacher was on the front line of the battle for equality, with an unforgettable delivery that rivaled King’s — and was often more unpredictable. Lowery had a knack for cutting to the core of the country’s conscience with commentary steeped in scripture, refusing to back down whether the audience was a Jim Crow racist or a U.S. president.