The University Of Michigan

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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 to students at the University of Michigan in Ann Arbor, Mich., Wednesday, April 2, 2014, about his proposal to raise the national minimum wage. (AP Photo/Carlos Osorio)

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President Barack Obama sits between Mira Friedlander, a 22 year old senior at the University of Michigan, left, and Aisha Turner, 36, a mother of three who has worked for nearly two decades as a server as he has lunch at Zingerman's Deli in Ann Arbor, Mich., Wednesday, April 2, 2014, before speaking at the University of Michigan about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)

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President Barack Obama sitting between Mira Friedlander, a 22 year old senior at the University of Michigan, left, and Aisha Turner, 36, a mother of three who has worked for nearly two decades as a server, and Rep. Gary Peters, D-Mich., right, have lunch at Zingerman's Deli in Ann Arbor, Mich., Wednesday, April 2, 2014, before the president was to speak at the University of Michigan 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 greets people on the tarmac upon his arrival on Air Force One at Willow Run Airport in Ypsilanti, Mich., Wednesday, April 2, 2014, before traveling to the University of Michigan to speak about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)

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President Barack Obama prepares to board Air Force One at Andrews Air Force Base, Md., Wednesday, April 2, 2014, en route to the University of Michigan to speak about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)

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President Barack Obama gives the thumbs up as he boards Air Force One at Andrews Air Force Base, Md., Wednesday, April 2, 2014, en route to the University of Michigan to speak about his proposal to raise the national minimum wage. (AP Photo/Carolyn Kaster)