It’s amazing when a statement makes less sense the longer you look at it. If people from London, Mississippi, and California are having a conversation, which of them is the native English speaker? Or are they all supposed to be pronouncing words the same? 

Yeah, I have relatives in the Twin Cities, and when I visit, I hear it all over the place, and as far away as Milwaukee. It’s not so much a Minnesota accent as a Minnesota/Wisconsin/North Dakota accent. Fargo, after all, is actually in ND.