I have served as a head election judge several times (including this year) and I’ll grant you the vouching system for same day registrations is very flawed but our paper ballot and double check system with the ballot readers are the best setup in the nation. Because our state has been so reliably liberal there is no need to have a weak balloting setup. So if Trump is surging here he will not be denied a win by the kind of games played in PA or FL. Remember Rep. Oberstar was defeated in the liberal of liberal areas in the iron range just a few years ago - the tide is shifting.
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.