President Obama has stayed neutral in the race to replace him, but as rumors swirl that Vice President Biden could jump in, a White House spokesman said Monday it's possible Obama will endorse. Saul Loeb/AFP/Getty Images hide caption

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Students protest the rising costs of college loans in Los Angeles in 2012. Citing bank bailouts, the protesters called for student debt cancellations. David McNew/Getty Images hide caption

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Republican presidential candidate Carly Fiorina poses for a photo in front of the Butter Cow while touring the Iowa State Fair on Monday in Des Moines. Justin Sullivan/Getty Images hide caption

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Former Florida Gov. Jeb Bush, Dr. Ben Carson, New Jersey Gov. Chris Christie, former CEO Hewlett-Packard Carly Fiorina, U.S. Senator Lindsey Graham, Louisiana Gov. Bobby Jindal, Ohio Gov. John Kasich, former New York Gov. George Pataki, former Texas Gov. Rick Perry, former U.S. Senator Rick Santorum (PA), Wisconsin Gov. Scott Walker stand on the stage prior to the Voters First Presidential Forum. Darren McCollester/Getty Images hide caption

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A supporter waves a Cuban flag in front of the country's embassy after it reopened for the first time in 54 years on July 20 in Washington, D.C. The embassy was closed in 1961 when U.S. President Dwight Eisenhower severed diplomatic ties with the island nation after Fidel Castro took power in a communist revolution. Mark Wilson/Getty Images hide caption

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Supporters of Democratic presidential candidate Sen. Bernie Sanders, I-Vt., cheer at a campaign rally in Portland, Maine. Sanders is packing 'em in: 10,000 people in Madison, Wis.; more than 2,500 in Council Bluffs, Iowa; another 7,500 in Portland. Robert F. Bukaty/AP hide caption

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Members of the media are kept behind a moving rope line as Democratic presidential candidate Hillary Clinton marches in a Fourth of July parade in Gorham, N.H. Robert F. Bukaty/AP hide caption

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