I know it hasn't happened, but I was asking what if it did. Since all the electors are partisan (in every state but two) then I agree it is highly unlikely to happen, but is Minnesota one of the states where the electors aren't partisan?
Nebraska and Maine, and, it's not that the electors aren't partisan, but that electors are selected separately, and not as a group. Maine has four electoral votes. Let's say that the overall winner of Maine loses one of that state's congressional districts. Then, for that district, the elector will be of the opposite party of the overall winner in Maine.