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FILE - In this March 7, 1965, file photo, state troopers swinging billy clubs to break up a civil rights voting march in Selma, Ala. Douglas Brinkley, a Rice University history professor and author whose works include books about the late civil rights icons Rosa Parks and Dr. Martin Luther King Jr., discusses differences between the 1960s civil rights protests and those of today. He says the '60s protesters were fueled by Christian credos, while today's have more "raw anger." (AP Photo/File)