Here's my opinion.
There is a lot of pride in that segment of the population. Pride in the difficulty of the jobs they perform. Pride in the fact that they may choose to figure out how to fix their own car, or put food on the table by fishing or hunting for it themselves. Pride in their families. Pride in the fact that even without a fancy education they, and their forefathers, have been able to carve out an existence.
I think they also feel it slipping away, and they don't feel like there is anyone they can trust to help them prevent that. They don't see government as a solution. They see government as a facilitator of the problem. Their neighbor writes a bad check and he gets convicted of a felony. Someone on Wall Street steals $20 million and they make a movie about them.
Donald Trump speaks to those feelings. Personally I think they're going to be disappointed in Trump's solutions, but they are certain Clinton doesn't hold the answers.
I've posted this theory before, but it bears restating. The Democratic Party is going to face this exact problem in the coming years. Everyone laughs at Trump when he asks African American voters, "can it get any worse?" But I guarantee you somewhere deep within the African American community that question will resonate. Trump isn't going to see the fruits of it, but that's not the last time that question will be asked, and they're going to realize the same thing rural white voters have realized. The two choices we're presented with every four years are not the answer.