The "national" polls are far out of sync with those in the Northeast coast. Illinois and Minnesota and the West Coast.
It also hurts their cause that these are media centers that distort the weight of their glam politicians.
There is no room for a modern day Bill Clinton to emerge.
Link: https://nymag.com/intelligencer/article/ignoring-polls-is-worse-than-over-relying-on-them.html