I live in eastern Iowa.
Walker was not well liked. He didn’t protect his people when the “John Doe” SWATing started. Many of them fled to Iowa.
I suspect Trump will take Iowa for the GOP, and Sanders for the Dems.
Seems likely to me as well, at least from this far.
Of course, a lot of Trump supporters will show up for the straw vote and leave, letting the same old people remain in charge of the next rounds and the party. We saw it last cycle with Santorum supporters.