The world's eyes were on President Obama today at Nelson Mandela's memorial. While he was on stage he shook the hand of Cuba's President Raul Castro. The White House says the moment was unplanned and uncomplicated. Some are calling this a sign of hope, while others call it a sign of surrender. John Berman discussed it with CNNPolitical Commentator Ana Navarro and Senior Political Analayst David Gergen.
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