Sen. Bernie Sanders (I-Vt.) addressed the Democratic National Committee in Minneapolis on Friday, taking the opportunity to criticize party leaders over the midterm elections and their hesitancy to take his candidacy seriously, Politico reports. "Let me be very clear. In my view, Democrats will not retain the White House, will not regain the Senate, will not gain the House and will not be successful in dozens of governor's races unless we run a campaign which generates excitement and momentum and which produces a huge voter turnout," said Sanders, who is not a member of the party. Frontrunner Hillary Clinton, who reportedly has a strong grip on party superdelegates, expressed frustration Friday at the continuing focus on her use of a personal email server while secretary of state.