The results from the YouGov/Brown Univ. poll has been fully pulled and will be redone because they sensed Yang Gang skewed the results

YouGov released a statement saying that the Oct '19 poll results (where Yang got 11%) is no longer valid and will be redone—likely to exclude new members who signed up (to vote for Yang) – https://watson.brown.edu/taubman/files/taubman/imce/taubman_national_f2019%20%281%29.pdf

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“YouGov was commissioned to a study of the electorate in the fall of 2019. It is YouGov's standard practice to exclude recently joined panelists from political tracking surveys, as during election seasons there are individuals who join survey panels with the express intention of distorting results in favor of a particular candidate. Unfortunately, the recent panelist exclusion was inadvertently omitted for this survey, which compromised the quality of the sample. We have asked the Tabuman Center to pull the public data associated with the compromised study and let YouGov recollect the data. It is YouGov’s corporate mission to ensure that our data is collected with the highest standards of quality.”