https://themidtermproject.org/turnout
According to this, 74% of the USA sat out of the midterms this year. Surely you agree that 74% of the population includes "a sizable portion of the Democrat base". The Democrats are so far right, people on America's left outnumber people on America's right 2:1. And the Democrats keep losing elections, because even though most Americans support UBI, universal healthcare, free education, electoral reform, and clean energy, they don't vote for the Democrats. Non-voters got America into this fascism situation. It will take people voting, protesting, and giving mutual aid to get America out of it.