Missouri people: What the hell happened to Jefferson County? It went from D+2 in 2008 to R+35 (!) in 2016! And it's not even rural, it's sububan! And even Galloway lost it! Was it Ferguson? I'm sure that had a lot to do with it, but there must be more to the story than that.
Why JeffCo flipped so hard right in recent years: backlash to Ferguson protests (also an issue that may have hurt the Democrats in the Metro East in Illinois as well), the Lila Perry culture war fight for trans rights in Hillsboro and subsequent backlash to such rights, the St. Louis suburb/exurb growth southwards (esp. down I-55 and MO-21), declining union influence, and the southern and western portions being rural in nature.