Hildabeast herself was responsible for at least that aforementioned margin with one horrible slandergaffe in which she named a huge portion of the electorate as "deplorable."
This resulted in a real grass roots "deplorable" movement and energized probably five to ten times that margin - right in the very places where it counted most.
Just on Facebook alone there are dozens of groups, many of them operating under FB's "secret" cover some with members in the thousands. These groups have adopted the title of "Deplorable" as a badge of honor and a call to action.
I belong to one of these groups that started in Minnesota and now has 6,000 members nationwide, but primarily in the key states to which you referred.
The Beast not only supplied the nails for her coffin, she obligingly swung the hammer.
Like most Democrats of her age group (’60s and ‘70s former hippies), she could not believe anyone would disagree with her opinions, condescendingly and arrogantly delivered.