Arizona State University

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Republican presidential hopeful Sen. Rand Paul, R-Ky., waves to supporters at a rally after speaking at Arizona State University Friday, May 8, 2015, in Tempe, Ariz. (AP Photo/Ross D. Franklin)

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Republican presidential hopeful Sen. Rand Paul, R-Ky., holds up his cellphone to make a point about government eavesdropping as he speaks at Arizona State University Friday, May 8, 2015, in Tempe, Ariz. (AP Photo/Ross D. Franklin)

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Republican presidential hopeful Sen. Rand Paul, R-Ky., waves to supporters as he arrives to speak at a rally at Arizona State University Friday, May 8, 2015, in Tempe, Ariz. (AP Photo/Ross D. Franklin)

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Former President Bill Clinton, left, listens as former Secretary of State Hillary Rodham Clinton speaks during a student conference for the Clinton Global Initiative University at Arizona State University. (AP Photo/Matt York, File)

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From left, Barry Goldwater Jr., son, Bob Goldwater, brother, Peggy Clay, daughter, Joanne Goldwater, daughter and Susan Goldwater, widow of the late U.S. Senator Barry Goldwater place their hands on his casket Wednesday, June 3, 1998, as they resite the Lords Prayer during funeral services at Gammage auditorium at Arizona State University. (AP Photo/Jeff Robbins)

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Image: Arizona State University

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Arizona State University third baseman Dalton Dinatale catches a fly ball during the second inning of an NCAA college baseball tournament regional game against Sacramento State on Saturday, May 31, 2014, in San Luis Obispo, Calif. (AP Photo/Aaron Lambert)

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In this May 7, 2014 file photo, Cory Hahn poses for a photo at Arizona State University's Packard Stadium in Tempe, Ariz. Playing in his third collegiate game at Arizona State on Feb. 20, 2011, he charged into second base while attempting a steal. Instead of gliding into the base, Hahn rammed into New Mexico second baseman second baseman Kyle Stiner's knee, jamming his head back into his spine. The collision left him paralyzed from the chest down. Hahn returned to ASU as a student coach and will graduate this month. (AP Photo/Matt York, File)

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In this May 7, 2014 file photo, Cory Hahn poses for a photo at Arizona State University's Packard Stadium in Tempe, Ariz. Playing in his third collegiate game at Arizona State on Feb. 20, 2011, he charged into second base while attempting a steal. Instead of gliding into the base, Hahn rammed into New Mexico second baseman second baseman Kyle Stiner's knee, jamming his head back into his spine. The collision left him paralyzed from the chest down. Hahn returned to ASU as a student coach and will graduate this month. (AP Photo/Matt York, File)