Minnesota, Wisconsin, Michigan have all been moving to center for years. There never was a blue firewall and it was a misconception that even the F'ing campaign seemed to buy into. When it became clear that Iowa wasn't competitive, I struggled to buy into the notion that MN and WI were truly impenetrable. I kept hoping I was being a bedwetter. Sadly, I wasn't. My instinct was correct that somehow this was a disconnect.
Minnesota has been competitive for awhile, folks.
Well yeah true part of "The Dem Wall" was shattered when Trump won Pennsylvania, Michigan, and Wisconsin which was the first time a Republican Presidential Candidate won those states since the days of Reagan/Bush H.W.
On the flip side most of "The Dem Wall" is still intact since every Dem Presidential Nominee has won the following states since 1992: California, Illinois, Maryland, Delaware, New Jersey, New York, Connecticut, Vermont, and Maine. Every Dem Presidential Nominee has also carried Oregon, and Washington State since 1984 while a Dem Presidential hasn't lost Minnesota since 1972(McGovern.)