CLINTON, IA - AUGUST 16:  Democratic presidential candidate U.S. Sen. Bernie Sanders (I-VT) holds up his mobile phone while answering a question about privacy issues during a campaign event at the IAFF Local 809 Union Hall August 16, 2015 in Clinton, Iowa. Sanders was scheduled for a full day of campaigning in eastern Iowa today.  (Photo by Win McNamee/Getty Images)
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