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U.S. Senator Marco Rubio (R-FL) announces his bid for the Republican nomination in the 2016 U.S. presidential election race during a speech in Miami, Florida April 13, 2015. Rubio, 43, announced his candidacy at Miami's Freedom Tower, where thousands of Cuban exiles fleeing the communist-run island in the 1960s were first registered by U.S. authorities.  REUTERS/Carlo Allegri  - RTR4X7J9 Carlo Allegri/Reuters
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