President Barack Obama calls Wisconsin volunteers as he visits a campaign office call center the morning of the 2012 election, Tuesday, Nov. 6, 2012, in Chicago. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama calls Wisconsin volunteers as he visits a campaign office call center the morning of the 2012 election, Tuesday, Nov. 6, 2012, in Chicago. (AP Photo/Carolyn Kaster)
President Barack Obama calls Wisconsin volunteers as he visits a campaign office call center the morning of the 2012 election, Tuesday, Nov. 6, 2012, in Chicago. (AP Photo/Carolyn Kaster)
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