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Republican Wisconsin Governor Scott Walker speaks in Milwaukee, Wisconsin, June 4, 2012. Walker faces Democratic challenger Tom Barrett in a recall vote on Tuesday because of a law he championed that severely curtails the power of public sector labor unions in the state. REUTERS/Darren Hauck (UNITED STATES - Tags: POLITICS ELECTIONS BUSINESS EMPLOYMENT) - RTR3341U Darren Hauck/Reuters, © Darren Hauck / Reuters