The Pipefitters and Plumbers should have thought of this before they endorsed Clueless Joe.
I know a guy who is a local official with this Union - during the campaign he was posting 100% Hate against President Trump.
The union endorsements appear to have almost no impact on voting patterns among white industrial union members. Look at West Virginia, eastern Ohio, and western Pennsylvania, old union territory that, except for Pittsburgh, voted for Trump by large margins. Except for civil service unions, labor unions no longer deliver votes for the Democrats. Like the mainline Protestant churches, the liberal political elite basically ignore the AFL-CIO, unlike in the days of Lane Kirkland or George Meany. Liberals have two sacraments: money and votes. Neither the mainline churches nor the industrial unions deliver the latter. So the powers that be ignore them