Upper Midwest does not speak for the whole nation. Sure, that was his main selling point there.
Even then, a coalition is needed to win everywhere, not just one single issue.
Actually in a way, they do. These voters will go back to the democrats in 2020 if Trump blows them off and goes into the mud with social issues. Again, the blue collar guy or girl who voted for Trump, voted for Trump BECAUSE of his economic ideas, not because of his stance on Abortion or gay marriage. If Trump fails them, they will either not vote or go back over to the Democratic party plantation.
Appoint the pro-life judges that he promised and move on. No need to waste valuable time here. Let the Supreme Court overturn Roe vs Wade. Its actually the best course of action with out getting bogged down in it.