In addition to the practical realities of a 2-party system as others are pointing out, there's the fact that the Left eats its own. Nobody is ever good enough, and compromising with "the enemy" is "bad", hence people can either keep their moral purity and lose, or else compromise their ethics in order to move forward, but not both. For example, Biden reached across the aisle and managed to get a ton of shit done - but who even cared? To anyone not on the right it wasn't enough, while to the right itself it was all (claimed to be) bad to begin with, hence the message of "BoTh SiDeS sAmE" won out and thus the puppetmasters wanting to influence the election got their desires met.

As long as people choose to remain in their ignorance, we can't influence outcomes for either better or worse.