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From above and reminding us all keep going, keep going. moving on. dont 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 johnsons 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 preside...