From what reporting I’ve heard, it’s an informal poll. If I had to guess, probably some google form that was emailed out to members. Given the leadership of the union spoke at RNC and praised Trump, I wouldn’t read too much into it.
That said, still very possible uneducated, mostly male members support Trump for personal reasons, and honestly I don’t know how much that should matter. The endorsement actually should reflect whatever candidate has the unions interest in mind, which is why most other unions are supporting the obvious, pro-union candidate.
In your honor I’ll use the term Smoochy Pit to refer to something lewd. At least then at least you’ll have your very own term named after you! Any suggestions on what it should mean?