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Barack Obama greets supporters at a campaign event at Mansfield Central Park in Mansfield, Ohio.

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Supporters cheer in the rain as Barack Obama makes his way onto the stage to speak in Glen Allen, Va.

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A boy salutes Barack Obama as he greets audience members following his remarks at the NALEO Conference in Orlando, Fla.

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Audience members cheer for Barack Obama during a campaign rally at Centreville High School in Clifton, Va.

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Supporters chant "Four more years!" as Barack Obama speaks at a campaign event at Dobbins Elementary School in Poland, Ohio.

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Barack Obama speaks during a campaign event at Roanoke Fire Station in Virginia.

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President Barack Obama talks with Jimmy Fallon during a taping of "Late Night With Jimmy Fallon" at Memorial Hall on the University of North Carolina Chapel Hill campus in Chapel Hill, N.C.

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Barack Obama greets patrons at the Sink Restaurant & Bar in Boulder, Colo.

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Barack Obama speaks at the University of Iowa Field House in Iowa City.

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Barack Obama waves with first lady Michelle after a campaign event in Columbus, Ohio.

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Barack Obama speaks during at a campaign rally at the Virginia Commonwealth University in Richmond.

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Barack Obama greets people after steeping off of Air Force One at Eastern Iowa Airport in Cedar Rapids.

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Barack Obama talks with Jimmy Fallon during a commercial break as he participates in a taping of Late Night with Jimmy Fallon at the University of North Carolina at Chapel Hill.

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Barack Obama arrives to speak about tax reform at Florida Atlantic University in Boca Raton, Fla.

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Barack Obama and first lady Michelle have dinner with campaign contestant winners at Boundary Road in Washington, D.C. The contestants were winners of a Democratic campaign contest to have dinner with the Obama's, and was the third such dinner event.

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Barack Obama greets Principal Beth Hamilton during a surprise motorcade stop in the rain to meet children and teachers at Medina Elementary School in Medina, Wash. Obama had been in a nearby neighborhood for a Democratic fundraiser.

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Barack Obama talks with Master Lock employee Eric Hammerer while visiting the Milwaukee, Wis., company.

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Barack Obama speaks to workers at the Master Lock factory on February 15, 2012, in Milwaukee, Wis. Obama applauded the company, which he cited in his State of the Union address, for bringing back 100 jobs to the U.S. from China.

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Barack Obama greets well-wishers after stopping for dim sum takeout lunch in San Francisco's Chinatown.

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Barack Obama speaks during a campaign event at the Apollo Theater in New York.

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Barack Obama has lunch with with winners of a campaign contest at Scion restaurant in Washington, D.C. Four small-amount campaign donors won the opportunity to have lunch with the president in a contest the Obama re-election campaign is using as an incentive for online giving.