That’s assuming both political parties actually want “something done”.
My own theory (without any real evidence) is that the oligarchs use race to divide the white working class from the non-white working class. A specific example is the video on systemic racism going around. It correctly points out redlining (a truly horrific practice), but also talks about black students having to attend underfunded schools. I attended predominantly black, underfunded, public schools my entire childhood. By this logic, I was at the same schools and was a "victim" of systemic racism. Which immediately implies that it was actually systemic classism at play against the working poor, rather than being purely race-based.
If a party chose to ignore the corporate overlords and focus on issues that working class people of all ethnicities cared about, they would get a lot of votes, and very few super PAC donations.
Many philosophers and others have written about how the powerful divide the lower classes in this way. I don't have any explicit citations offhand, but your observations have merit amongst those who study these issues.
Fascinating. I grew up in rural Virginia. A little Known fact is that the vast majority of white settlers there were indentured and/or bonded, often convicts. The first Africans in 1619 were indentured as well. Horrifically, in the 1650s when the first African slaves were brought over, the elites pushed further changes in social norms that resulted in a significant worsening of treatment of the African indentured servants who had long since become free landowners and farmers. A formerly indentured, free black man had a prosperous farm a few miles from where I grew up. The courthouse there dates to the 1600s, and the records are there that show jealous white neighbors gradually stealing his land with impunity, starting at the time that slaves started becoming common. It is chilling looking at those documents standing in that building.
Centre-right to right: https://politicalcompass.org/uselection2020
(edit: I get that "objectively" is probably not the correct word to use there, but I hope you get my meaning; it would be nice if someone could suggest a better one. Probably better to just have written "the views or proposed policies of 'left' or 'extreme left' US politicians are only contextually leftist").