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Republican Governor Scott Walker and challenger Democrat Mary Burke, a former executive at bicycle manufacturer Trek, are statistically tied in recent polls of politically divided Wisconsin.
Walker, a possible 2016 White House hopeful, became a champion of conservatives when the state reduced the powers of public sector unions, a move he said helped eliminate a $3.6 billion state budget deficit.
Burke has attacked Walker for falling short on his promise four years ago to create 250,000 jobs in his first term. Government data shows about 100,000 jobs have been created.
