Congressional districts are a whole 'nuther ballgame. They are much more local, and shifting demographics can have an affect on that scale.
I was an election judge for several years, always in South Minneapolis precincts. One was on the edge of downtown in a massively Democrat area. Our precinct manager was a Democrat. He treated EVERY ballot like a newborn baby in a pro life family. He did so even with Republican "write-ins." I would trust him anywhere. He proved there may still exist an honest Democrat, a dying breed.
I quit as an election judge when Norm Coleman had that Senate election stolen with the encouragement of the Minnesota judiciary.
That was a statewide race. If such is a blowout, no need to bring out the election grease and oil. For a close call, you only need corruption an a precinct or three to make all the difference. There are obviously corrupt precincts and a corupt bunch of court judges to say, "That's OK."
P.S. I am Vice-Chair of my BPOU. Our goal has always been to maximize our vote turnout in Minneapolis and Richfield to do our best to help statewide races.
At our last meeting I suggested I may bow out of that if clinton wins. If someone as openly corrupt as clinton can win, we are all just wasting our time because we no longer have a country, defacto. That will become real to everyone soon enough when she gets her way on so many issues.
I guess I'm of the cynical persuasion.
I was the chair of the largest single BPOU in the state (northern metro) and I’ve run into a few noble, old world democrats even in the midst of partisan contests. I was mayor of a first ring suburb for a term - even endorsed by the IRs. I quit the party after 30 years of time, money and service due to “establishment” mentality pervading things these days so I’m equally cynical in some ways. I bring up Oberstar only as an example that the seemingly impossible can be pulled off. I called that race 2 months before the election and was soundly mocked for my assertions. I saw the campaign signs out early for his opponent and in areas I was surprised about. It hinted at something going on. I’ve seen the exact same thing for Trump here in the western half of the state the past 2 months and in areas that aren’t particularly conservative. There’s a chance... a real one.