But I thought Missouri was the next Wyoming.
It's not the next Arkansas yet. I'm not sure when the republicans start dominating everything, but it's probably less than ten years away.
The big difference between Missouri and Arkansas though, is that Missouri has two major urban centers keeping it a lean/likely R state at the presidential level in neutral years, and giving statewide Democrats a chance. Rural whites will inevitably continue to trend R, but that's somewhat offset by St. Louis and Kansas City.