I would argue that there isn’t a "far-left" or "hardcore left" element in this country that has power. Bernie and the squad don't exactly run the Dems.
Since Regan there's really only been two dominant political ideologies; neoliberalism (economic) and neoconservatism (foreign policy). Everybody sort of fell into those boxes.
The people running the country have been neolibs with some rainbow sprinkles for diversity's sake. They'll do what they did under Regan and pull rightward to maintain power, if they're allowed to. They'll all become Blue Dogs if it keeps them seated.
The issue is that neoliberalism is dying overall, because it's failing to address the actual citizens concerns. It's why populism is rising, as seen in some really weird ways. Think of the bernie bros who voted Trump or the perfect example of the strangeness of American politics,
People who split ticket voted for Trump and AOC. They overwhelming just voted against the current ideology, even if they might no word it as such.
I don't think at
@amlove21 is wrong in his assessment that a new ideology needs established while you've got the chance.