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Associated Press
Police officers stand at a Polling station during a referendum in Harare, Zimbabwe, Saturday, March, 16, 2013. The referendum this weekend mirrors the hopes and fears of four previous elections which were marred by violence and vote-rigging since Tsvangirai, a former labor leader, founded his Movement for Democratic Change party, the first real challenge to Mugabe, in 1999. (AP Photo/Tsvangirayi Mukwazhi)

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