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epa02669459 (FILES) A file photo dated 20 January 2009 showing Barack Obama taking the oath of office as he is sworn in as the 44th President of the United States in Washington, DC, USA . Obama announced 4 April 2011 his intention to stand for a second term in office in 2012. The announcement was widely expected and his campaign team are expected to file election papers this week EPA/MATTHEW CAVANAUGH