Barack Obama

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President Barack Obama waves as he speaks about his proposal to raise the national minimum wage, Wednesday, April 2, 2014, at the University of Michigan in Ann Arbor, Mich. The president said raising the minimum wage won't solve all of the nation's economic problems. But he says it's good for business, increasing productivity and giving workers more buying power. (AP Photo/Carlos Osorio)

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President Barack Obama speaks about his proposal to raise the national minimum wage, Wednesday, April 2, 2014, at the University of Michigan in Ann Arbor, Mich. The president said raising the minimum wage won't solve all of the nation's economic problems. But he says it's good for business, increasing productivity and giving workers more buying power. (AP Photo/Carlos Osorio)

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President Barack Obama pauses as he speaks about his proposal to raise the national minimum wage, April 2 at the University of Michigan in Ann Arbor, Mich. (AP Photo/Carolyn Kaster)

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President Barack Obama waves as he arrives to speak at the University of Michigan, Wednesday, April 2, 2014, in Ann Arbor, Mich., about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)

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President Barack Obama speaks at the University of Michigan, Wednesday, April 2, 2014, in Ann Arbor, Mich., about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)

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President Barack Obama pauses as he speaks about his proposal to raise the national minimum wage, Wednesday, April 2, 2014, at the University of Michigan in Ann Arbor, Mich., . (AP Photo/Carolyn Kaster)

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President Barack Obama speaks about his proposal to raise the national minimum wage, Wednesday, April 2, 2014, at the University of Michigan in Ann Arbor, Mich. The president said raising the minimum wage won't solve all of the nation's economic problems. But he says it's good for business, increasing productivity and giving workers more buying power. (AP Photo/Carolyn Kaster)

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President Barack Obama, accompanied by Rep. Gary Peters, D-Mich., right, talks with employee Andrea Byl to order lunch during their visit to Zingerman's Deli in Ann Arbor, Mich., Wednesday, April 2, 2014. Afterward, the president traveled to the University of Michigan to speak about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)