I don't really think of Michigan or Wisconsin as swing states any more. Given hyperpartisanship, I don't think you'll ever see Reagan or Johnson-style victories again. Instead, you're much more likely to see the more European party of slim election margins lacking in swing voters. Anything where Obama won with at least 5% in 2012, a relatively poor victory election, is not really a 'swing state' in the true sense of the term [that is, has a reasonably significant statistical likelihood of being the marginal state]. IMO, the swing states are Colorado, Florida, Virginia, Ohio and maaaybe Nevada. As far as I know, all five of these are trending Democratic.