Never underestimate the power of negative polarization
Unfortunately this is a weakly held belief, and the elites themselves have embraced protectionism (Biden admin was not a free trader admin) so this is definitely going nowhere.
It definitely is weakly held - but a lot of beliefs in politics are! Not all, there are "core" motivations, but I think a ton of the anti-trade stuff has been culture war piggybacking and does not inherently need to stick to either coalition. It *might*, precisely because it is weak, but I would not at all be surprised if "free trade to lower your car payments" is part of the battlespace in the 2028 primary.
Political elites channeling the inchoate desires of the electorate into an actual policy agenda is what democracies are supposed to do after all, and there are so many "signature" issues of like 2012, even 2020, that have retreated into the background as part of that process. It is a messy world for political coalitions.
How weakly held can you truly call this? Many elites imagine a base of protectionism in the average American, and many people probably somehow hold "I support free trade" and "I support protecting our domestic jobs from foreign competition" at the same time, because they don't know very much. Sure. But these are still huge numbers! If a supermajority of Republicans support free trade, then I can't avoid the conclusion that there's a substantial base of genuine enthusiasm in every group listed.
You outline it yourself - if you think "free trade is good" but also "we need to protect American jobs from foreign imports", than you don't believe a coherent thing, those directly contradict! And I can easily find polls showing the majority of Americans believing the latter. So there is no one belief here - instead voter opinions are based on what is topical, their opinion will shift towards this or that prior belief from the grab bag. I am not even insulting the voters! The electorate is a vast pool of people, polling questions are vague, and when the facts of the day change your opinion should change. In other posts I will insult them? They deserve it. But I don't need to here.
So in present day, present time America, totally deserving 5-Minute-Hate target Donald Trump is president. He is doing extremely unpopular things, bumbling around with tariffs like a coke addict chasing his next hit while also fighting a war no one wanted and taking bribes he doesn't even need purely as a flex. So everyone hates tariffs now, and likes free trade, because right now that means Trump's idiot tariffs, and also honestly his dumb war too because fuck that guy. But in 2029 the Harris/Newsom duo will be dealing with a flood of say Chinese AI RoboClinics offering discount surgeries and medicine, and as much as people like cheap goods America's largest industry by headcount hates that way more than you like it, and also insurance was covering that shit anyway. So now voters "hate free trade" again. This is just how public opinion on most issues works, and it something politicians need to manage.

















