Total guess based on simple assumptions. I'll also say that I think a HEALTHY majority of voters don't really have a concrete opinion on trade. There are millions and millions of Republicans who probably went from, "free markets are the best markets!" to "America first!" just because Trump phrased it in the right way, and the opposite is probably true of Democrats who went from distrusting "deregulation" to thinking, "free trade is a big city thing, so I support it!" Not folks on this site, but lots of ordinary folks. The more fascinating splits would be within some of the states. I'd be open to changing a huge chunk of these or defending my picks, but this is how I think voters in these would answer this simple question without any politicians or political parties name dropped:
"Do you generally support free trade or protectionism?"
I think you're really underestimating protectionist sentiments in Missouri and the PNW.
