It's a good piece. Here are some excerpts:
In interview after interview in all corners of the state, I've found that Trump's support across the ideological spectrum remains strong. Democrats, Republicans, independents, people who have not voted in presidential elections for years — they have not wavered in their support.
Two components of these voters' answers and profiles remain consistent: They are middle-class, and they do not live in a big city....
While Trump supporters here are overwhelmingly white, their support has little to do with race (yes, you'll always find one or two who make race the issue) but has a lot to do with a perceived loss of power.
Not power in the way that Washington or Wall Street board rooms view power, but power in the sense that these people see a diminishing respect for them and their ways of life, their work ethic, their tendency to not be mobile ...
These are voters who are intellectually offended watching the Affordable Care Act crumble because they warned six years ago that it was an unworkable government overreach. They are the same people who wonder why President Obama has not taken a break from a week of golfing to address the devastating floods in Louisiana. (As one woman told me, “It appears as if he only makes statements during tragedies if there is political gain attached.”)
Voice such a remark, and you risk being labeled a racist in many parts of America. ...
It is no surprise that white identity politics is, if not rising, as least more visible today. The Progressives, especially the culture warriors, have been using identity politics as a political arsenal for decades. At some point, it was probably inevitable that some whites would surrender to the Progressive agenda and embrace identity politics themselves.
That said, I think the vast majority of Trump supporters are not thinking about "white identity" themselves, but are concerned about the racism that's been used against them for the last couple of generations, and which seems to be getting worse. That's a legitimate concern, and no one needs to adopt white identity politics to address that.
Zito's claims make sense to me: Trump support is in large part about being on the losing-but-right side in the culture wars, and it's about the unjust economic consequences of that for the future. She notes that Trump supporters themselves are more likely to be employed and solidly middle class; it is their children and grandchildren they fear for.

