I'm just going to be honest about this, a lot of the problem is misogyny. The more Democrats elevate Black and brown women the more certain men will feel threatened.
This goes back to something I keep saying: the Democrats are a coalition. Appealing to one part of that coalition often risks alienating another part. This something continually ignored when people complain about Democratic "messaging." Blow mentions that lots of Black and Brown men oppose abortion. What "message" does he think Dems can offer someone like that?
I don't trust anyone on the left who complains about the two-party system. This is it. There isn't ever going to be a viable third party so deal with reality.