Bizarre article that thinks the rise of worker power through unions might be bad for the Left?
Of course, this is also balanced out by the fact that the Republican Party has no clue where to go post-Trump (or, hell, post-Romney). They can't even get internal consensus on electing a House speaker.
I'm pretty sure this article's author has an axe to grind against both left-wing politics and the DNC, though. The article's premise relies on the idea that a good chunk of the Democratic Party virtue-signals progressive causes to avoid criticism of their labor practices. That's true, but not the whole story - the Republican party is similarly paralyzed by the donor class. The underlying problem is that SCOTUS kicked the legs off of election finance rules in the name of the 1st Amendment. First they said money can be speech (reasonable) and then said there's no justification for contribution limits (wtf no).
So now corporations regularly outspeak everyone else. Both parties are ideological zombies made up of call center employees who regularly moonlight as Senators and Representatives. This gives rise to "anti-partisan" issues; where both parties agree to kill "common-sense" or "everyone agrees on this" kinds of bills that would harm the donor class interests. Think about how much of a problem it has been just to get decent right-to-repair legislation going, just as an example.