Fifty years ago today, a mule train left the small town of Marks, Miss., bound for the nation's capital. They were answering a call to action the Rev. Martin Luther King Jr. made just days before he was assassinated.
"We're coming to Washington in a poor people's campaign," King announced at the National Cathedral in Washington, D.C., on March 31, 1968. "I was in Marks, Miss., the other day, which is in Quitman County, the poorest county in the United States. And I tell you I saw hundreds of black boys and black girls walking the streets with no shoes to wear."