Minnesota also had a lot of swing house seats. He should have gone.
Next election he should think of house seats because it will be close next election.
There is a very good reason why Trump did not go to Minnesota and Michigan. They are still blue states, which means that a visit by Trump would likely bring out otherwise unmotivated Democrats to the polls. You don’t see Hillary campaign in Florida “s panhandle? Why? Because you don’t want a higher turnout in an area that will vote 2:1 against you. We want higher turnout in AZ , Tennessee, Missouri, etc, but lower turnout in Michigan and Minnesota.