What's Up in Missouri?

In my ongoing quest to figure out what is happening to my state, I present this chart from a fivethirtyeight post today:

So only Utah has moved more toward the Republican candidate that Missouri in the last 4 years. That would be the same Utah that is the home of Mitt Romney's Mormon faith. I think that makes it fair to exclude them and assert that, if the polls are correct, Missouri is home to the fastest growing Republification (can I TM this?) in the U.S.

Now maybe the polls aren't correct. But if they are... what the hell is going on?