Also by the fact that their unwillingness to turn on their capital sponsors, who don't really care whose in power and whose needs are ostensibly better met by republicans (so long as republicans don't start a trade war...)

Dems will continue to make the mistake of coasting deeper into the right wing, picking up 0 voters in doing so (why would I vote for a "tough on immigration" candidate when I can vote for the one who gleefully promises to deport all the browns?), meanwhile disenfranchising any left wing voters left in the USA and creating no new left wing voter bloc by presenting a coherent alternative to the reactionaries.

The same mistake is being made by neo liberal parties across the world.