I don't like unions, but this isn't the issue here.
We need to realize that the end game of globalized production is the worldwide equalization of standards of living. We in the US are doomed to declining wages, particularly in manufacturing. Services will take longer, but given our unrestricted illegal immigration, and the non necessity of the english language, service sector wages are, and will continue to decline as well.
The left sees this as good and equitable, because they are citizens of the world who dislike this country.
A nationalist candidate would do well.