Back in the days when everyone had a landline phone it was much easier to produce an accurate poll. These days I am afraid many pollsters have found an alternative way of producing value for a customer that is far easier to pull off.
Social Media and Email data mining are far more accurate than old style polls.
They knew she was losing in 2016 and they know what the score is right now.
These polls are meant to discourage our side, especially in terms of donations.