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Civil rights hero/superdelegate Congressman John Lewis (GA) makes the switch once and for all from Clinton to Obama. Lewis: "It's been a long, hard and difficult struggle to come to where I am now." Tells NBC's Andrea Mitchell that this decision was harder than his famed 1965 March on Selma. Click above to watch. Obama's statement: "John Lewis is an American hero and a giant of the Civil Rights Movement, and I am deeply honored to have his support." Politico says the pressure for Clinton's black supporters to do the same is mounting.