This might be true, I honestly don't know where the truth is on this. But I'd take a bit of convincing. There are potential complications.
For one, does it matter what the 'bulk of the base' consists of? What determines outcomes is what happens at the margins, what happens with the people you might hope would support the left but fail to do so (including if they just stay at home and don't vote, not just if they vote for Trump).
Secondly I'm a little bit suspicious of these arguments because the case for them tends to be built, and the evidence for them gathered, by the very people who have a bit of a vested interest in saying it isn't about economics - i.e. well-off securely employed commentators and academics who are doing very nicely thankyou with things as they are. Do those people have a strong motivation to look for contrary evidence?
Thirdly, are racial identities and economics entirely separate things? Is it not possible that cultural identity issues become more important to people as hopes of economic improvement decline? Often seems that way to me - everyone gets on with each other much better when there's loads of money sloshing about, smoothing relationships and giving people something else to think about than how much they fear/dislike the 'other lot'.
It's also not necessary for people to be experiencing serious economic difficulty right now for economics to matter, they just have to be losing hope that their position will improve in the long term.
Very well said. And if one reads the details of the article, the population surveyed is not a representative sample of the voting public, but a survey of those who voted for Obama and then switched to Trump instead of Hillary. I do agree that the results were oversimplified and consciously or unconsciously bent to fit the bias of those who made the study, i.e. well educated, employed professionals in an academic setting which tends to be a more liberal environment. I am not saying it is right, but this election proved that there is a strong undercurrent against the liberal reforms of the last few decades, but I believe economics played a strong part as well. And in addition, a lot of voters were not really voting for trump, but against Hillary. Lets face it, Hillary was just not a personally appealing candidate, and came with a lot of political baggage. And the Trump campaign certainly ran a masterful job of character assassination, especially for supporters of someone with such a sketchy past himself. And then you have the gun lobby, who were convinced that Hillary was going to come an take all their guns.
So it is a very complicated situation, but imo, the democrats should certainly not abandon social justice and environmental issues, but they do need to examine them closely and examine the cost/benefit equation. And please JUST STOP beating people over the head with them, and get back to supporting the working class, and at least sympathize that all this change may be hard to accept. And certainly dont call them "undesirables" like Hillary did.
Edit: I do find it amazing though that Trump manages to insult everyone from world leaders to the handicapped, his own government agencies, anyone who disagrees with him, and pretty much anyone he feel like, with the most insulting language possible, and no one seems to care, and it only endears him more to his base.