I have to respectfully disagree. Any "failure of the polling process" by 'nearly every major forecaster' is 100% intentional, being done by Democrats, and is meant to manipulate public opinion. There is no logical way to explain away why 'nearly every major forecaster' ALWAYS "misses" in a manner that shows more support for Democrats than there actually is. If these "misses" were genuine misses, then they would also (just as often) miss in the opposite direction (showing more support for Republicans than there actually is). There are VERY FEW forecasters who will miss in such a manner.
You will also notice that they follow a general pattern of severely inflating Democrat support (especially during the Summer) and then "herding" (closer to reality) a few weeks before (s)election day. It's not a "failure of the polling process"; it's done intentionally with the intent to manipulate public opinion.
