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By Rosa-Tania Valdes HAVANA (Reuters) - For sure it's just what Nelson Mandela would have wanted, but does it amount to more than that? The historic handshake between U.S. President Barack Obama and Cuba's Raul Castro at a memorial for Mandela on Tuesday in Johannesburg was greeted on the streets of Cuba with surprise and hopes of improved relations. Reaction was more muted in Miami, where Cuban exiles have had a hard time accepting Mandela's respect for Cuban leader Fidel Castro. Castro's smile as Obama moved to shake his hand on the way to speak at the ceremony was seen by many Cubans as a signal of reconciliation, after more than a half-century of bitter ideological and political differences between the two countries whose shores are separated by only 90 miles.