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MANASSAS, VA - SEPTEMBER 14:  Thousands of people gather to hear Democratic presidential candidate Sen. Bernie Sanders (I-VT) during a campaign rally at the Prince William County Fairground September 14, 2015 in Manassas, Virginia. Sanders addressed 12,000 students at Christian Liberty University earlier in the day. (Photo by Chip Somodevilla/Getty Images)
MANASSAS, VA - SEPTEMBER 14:  Thousands of people gather to hear Democratic presidential candidate Sen. Bernie Sanders (I-VT) during a campaign rally at the Prince William County Fairground September 14, 2015 in Manassas, Virginia. Sanders addressed 12,000 students at Christian Liberty University earlier in the day. (Photo by Chip Somodevilla/Getty Images)

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