Washington Post: Sanders briefed by U.S. officials on Russian efforts to help his campaign, U.S. officials tell Sanders Russia is interfering in his campaign, Nevada caucus volunteers given confidentiality agreements

Washington Post: Sanders briefed by U.S. officials on Russian efforts to help his campaign, Sanders: some "ugly stuff" on the internet may not be coming from "real supporters", U.S. officials tell Sanders Russia is interfering in his campaign, Nevada caucus volunteers given confidentiality agreements

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