Here are the DNC's specific requirements for approved polls (for debate purposes).

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https://democrats.org/news/third-debate/

Each poll must be sponsored by an approved organization, which presently includes the following: Associated Press, ABC News, CBS News, CNN, Des Moines Register, Fox News, Monmouth University, NBC News, New York Times, National Public Radio (NPR), Quinnipiac University, University of New Hampshire, Wall Street Journal, USA Today, Washington Post, and Winthrop University. Any candidate’s four qualifying polls must be conducted by different organizations, or if by the same organization, must be in different geographical areas. The DNC and its media partners reserve the right to add a Nevada-specific poll sponsor to this list in the near future.


For the September debate, each poll must be publicly released between June 28, 2019, and August 28, 2019. Deadlines for qualifying polls ahead of the October debate will be released in the future.

Each poll’s candidate support question must have been conducted by reading or presenting a list of Democratic presidential primary candidates to respondents. (Poll questions using an open-ended or un-aided question to gauge presidential primary support will not count).

Each polling result must be the top-line number listed in the original public release from the approved sponsoring organization/institution, whether or not it is a rounded or weighted number.