In An article in The Intercept by Zaid Jilani, he states that “Bernie Sanders Gets Group Endorsements When Members Decide; Hillary Clinton When Leaders Decide”
18 organizations are looked at. I don’t know if that is statistically significant. It still seems a bit early in the process, but this does sound like a clear distinction. We don’t get any insight as to how close any of these leadership or membership votes were. It’s conceivable that leadership slightly favors Clinton while membership slightly favors Sanders.
Every major union or progressive organization that let its members have a vote endorsed Bernie Sanders.
Meanwhile, all of Hillary Clinton’s major group endorsements come from organizations where the leaders decide. And several of those endorsements were accompanied by criticisms from members about the lack of a democratic process.