mostly tied into supremacists. especially strong in Michigan and the west. 99% white

My first clue was "Democrat".

So, the first thing I found about IFS


https://mediabiasfactcheck.com/institute-for-family-studies/

To assure accuracy. If not they can not be trusted. I’m not buying the stats they came up with. I didn’t see how they were gathered or reviewed.
It is a Right-leaning .org and that is a huge red flag.

The Guardian reviewed his latest book recently - they don't seem to regard him as biased: https://www.theguardian.com/books/2019/mar/22/the-alt-right-by-george-hawley-review

"Notes: According to their mission page “The mission of the Institute for Family Studies (IFS) is to strengthen marriage and family life, and advance the well-being of children through research and public education.” IFS was founded by William Bradford Wilcox who is Director of the National Marriage Project at the University of Virginia, Professor of Sociology at the University of Virginia and a Visiting Scholar at the conservative American Enterprise Institute."

as the author seems to prefer, from the note at the top: "Editor's Note: This research brief has been updated by the author with corrected information: only about 6% of white Americans agreed with all three attitudes of white identity politics in the 2016 ANES survey (8/10/18)."

And those absolute figures for who you'd call a "white nationalist" seem more reasonable - 5.6%, rather than 37.7%, for everyone.

So that shows the youngest age group above the 30-44s, but below 45+. "Most" still doesn't look right.

That people who earn less than $30K are more likely to be white nationalists than people who make more than that. Income inequality is a huge part of the problem.

Kinda off topic, just observing that when “gang” or “gang violence” is heard “White Nationalist” is not the first thing that comes to mind with people.

They're home to the III%, Patriot Prayer, and the Bundy Militia, just to name a few.