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From above and reminding us all keep going, keep going. moving on. don't sit on your laurels. >> reporter: now, in all, four presidents will have spoken at the end of this summit. they will have made similar points that a lot of difficult work remains. to some extent, this is a chance to recast johnson's legacy which historians have said has been overshadowed by some extent by the vietnam war and this week focusing on the incredible progress that was made in civil rights during his time as president. tamron, back to you. >> thank you. our special coverage starts at noon today on msnbc with and...