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Volunteers roll up posters marking the 50th anniversary of Dr. Martin Luther King Jr.'s 'I Have a Dream' speech during the annual holiday commemorative service in his honor at the Ebenezer Baptist Church, Monday, Jan. 21, 2013, in Atlanta. The nation will honor civil rights leader Martin Luther King Jr. on Monday, the same day as it celebrates the inauguration of the first black president to his second term. (AP Photo/David Goldman)

Martin Luther King Jr. honored

America's concern over gun violence became the focus of speeches in

Atlanta on Jan. 21 honoring Dr. Martin Luther King Jr., who led a

non-violent struggle for civil rights before he was gunned down at age