Some people are not too happy with the DNC-definition of qualifying polls, as it leaves out quite a few polls from bigger publications, which could help push some candidates over the qualification line. The ones it would help are Tulsi Gabbard, Tom Steyer, Marianne Williamson, Kirsten Gillibrand and Jay Inslee.
Read (and see) more:
https://www.youtube.com/watch?v=_H6Puy43Ia0