The Rev. Jesse Jackson (C) joins elected officials and Memphis sanitation workers to unveil a street sign during a ceremony to rename Linden Avenue to "Dr. M.L. King Jr. Avenue" in Memphis, Tennessee, April 4, 2012. The civil rights leader was assassinated 44 years ago on April 4, 1968. REUTERS/Lance Murphey (UNITED STATES - Tags: SOCIETY POLITICS ANNIVERSARY TPX IMAGES OF THE DAY)