Democratic Presidential Candidates Speak At DNC Summer Meeting In Minneapolis [Getty Images]

MINNEAPOLIS, MN - AUGUST 28: Democratic Presidential candidate U.S. Sen. Bernie Sanders (I-VT) speaks at the Democratic National Committee summer meeting on August 28, 2015 in Minneapolis, Minnesota. Most of the Democratic Presidential candidates including Sanders , Hillary Clinton, Martin O'Malley and Lincoln Chafee are attending at the event. (Photo by Adam Bettcher/Getty Images)

Getty Images News Adam Bettcher