The big unions line up behind the Democrats each and every election, worrying about a creature which has no interest in being your friend is useless. Unions will attack no matter what, 'more presidential' is not what got Trump the nomination, and it will give Bill Clinton a 3rd term.
The union bigwigs are who want the Democrats always. Rank and file is just as likely to be conservative, they do not live in the airy fairy Democrat world.
Unions? NONSENSE! Union LEADERS get one vote each. Rank and file members get one vote each = 15,000,000 votes. Pro jobs, anti bad trade deals, wall builder, Trump will get a large share of those votes.
It’s like the Chiefs of Police Ass. They don’t speak or represent the views of beat/patrol cops.