Rev. Martin Luther King Jr. Rev. Martin Luther King Jr.
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Rev. Martin Luther King Jr.

The mule train comes into the Washington area against a late afternoon sky in June of 1968. The caravan left Marks, Miss., for the nation's capital on May 13 to participate in the Poor People's Campaign. Bob Daugherty/AP hide caption

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Bob Daugherty/AP

How A Mule Train From Marks, Miss., Kicked Off MLK's Poor People Campaign

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Actress Nichelle Nichols -- "Lt. Uhura" -- at the Kodak Theater in Hollywood on Nov. 3, 2010. Mark Ralston/AFP/Getty Images hide caption

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Mark Ralston/AFP/Getty Images