This excerpt from a piece by Michael Moore makes the most sense to me:
“Here are the 5 reasons Trump is going to win:
• Midwest Math, or Welcome to Our Rust Belt Brexit. I believe Trump is going to focus much of his attention on the four blue states in the rustbelt of the upper Great Lakes – Michigan, Ohio, Pennsylvania and Wisconsin. Four traditionally Democratic states – but each of them have elected a Republican governor since 2010 (only Pennsylvania has now finally elected a Democrat). In the Michigan primary in March, more Michiganders came out to vote for the Republicans (1.32 million) that the Democrats (1.19 million). Trump is ahead of Hillary in the latest polls in Pennsylvania and tied with her in Ohio. Tied? How can the race be this close after everything Trump has said and done? Well maybe it’s because he’s said (correctly) that the Clintons’ support of NAFTA helped to destroy the industrial states of the Upper Midwest. Trump is going to hammer Clinton on this and her support of TPP and other trade policies that have royally screwed the people of these four states. When Trump stood in the shadow of a Ford Motor factory during the Michigan primary, he threatened the corporation that if they did indeed go ahead with their planned closure of that factory and move it to Mexico, he would slap a 35% tariff on any Mexican-built cars shipped back to the United States. It was sweet, sweet music to the ears of the working class of Michigan, and when he tossed in his threat to Apple that he would force them to stop making their iPhones in China and build them here in America, well, hearts swooned and Trump walked away with a big victory that should have gone to the governor next-door, John Kasich.
From Green Bay to Pittsburgh, this, my friends, is the middle of England – broken, depressed, struggling, the smokestacks strewn across the countryside with the carcass of what we use to call the Middle Class. Angry, embittered working (and nonworking) people who were lied to by the trickle-down of Reagan and abandoned by Democrats who still try to talk a good line but are really just looking forward to rub one out with a lobbyist from Goldman Sachs who’ll write them nice big check before leaving the room. What happened in the UK with Brexit is going to happen here. Elmer Gantry shows up looking like Boris Johnson and just says whatever shit he can make up to convince the masses that this is their chance! To stick to ALL of them, all who wrecked their American Dream! And now The Outsider, Donald Trump, has arrived to clean house! You don’t have to agree with him! You don’t even have to like him! He is your personal Molotov cocktail to throw right into the center of the bastards who did this to you! SEND A MESSAGE! TRUMP IS YOUR MESSENGER!
And this is where the math comes in. In 2012, Mitt Romney lost by 64 electoral votes. Add up the electoral votes cast by Michigan, Ohio, Pennsylvania and Wisconsin. It’s 64. All Trump needs to do to win is to carry, as he’s expected to do, the swath of traditional red states from Idaho to Georgia (states that’ll never vote for Hillary Clinton), and then he just needs these four rust belt states. He doesn’t need Florida. He doesn’t need Colorado or Virginia. Just Michigan, Ohio, Pennsylvania and Wisconsin. And that will put him over the top. This is how it will happen in November.”