Outperforming Romney by 17 in MN-8 while underperforming Romney by 12 in MN-3 and underperofrming Romney by 8 in MN-2 suggests Trump will overall roughly match (-1) Romney's performance (assuming that suburban and rural districts are roughly equitable). Losing Minnesota by 9 certainly does not help Trump's cause, but it also suggests that most of these national leads showing Clinton up double digits are bogus.
MN is an inelastic D state. This has already been discussed at length in the forum before. MN does not move at a 1:1 ratio with the rest of the nation in either direction, so your extrapolation is not very useful.
