let me break this down, and it's not complicated
80% of the country either identifies as republicans, or moderate democrats. 20% of the country identifies as progressives. if it's the far left vs everyone else, the left loses soundly, when it comes down to it
if progressives refuse to drop the weird, unpopular bullshyt that makes them unviable in national politics, they will never gain any traction
yes, universal childcare is popular. you know what isn't? calling anyone who doesn't encourage illegal immigration a "bigot". calling anyone who knows the difference between a man and a woman a "transphobe". scolding people about using plastic forks, and driving trucks. progressives simply cannot get out of their own way; they relegate themselves to dark blue areas only, because nobody likes them