There is a winery, my wife and I have visited a few times on our way up to Minnesota, It is on Hwy 63, just barely into Minnesota. Four Daughters Vineyard & Winery, Spring Valley, MN. They make a very good Marquette. They seem a bit proud of it to me, but not horribly so.
Another really good one, and I think I remember them saying that their wines were available at some stores is Alexis Bailly Vineyard Hastings, MN.