The following is from the Michael Moore article that I mentioned above... (@Link below)
I believe Trump is going to focus much of his attention on the four blue states in the rust belt 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) than 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.
More @ CHARISMA