Our democracy was designed under the assumption that power corrupts. That's why we have checks, balances, and essentially a framework that make it in a politician's interest to do what the people want.
So far, so good, but you get it way wrong after:
Therefore the politicians' interests are roughly aligned with the people's interests via playing politics and winning elections. A good chunk of Democrats refuse to do said, and this is partly responsible for the current status-quo.
That's just delusional.
The main story of American politics is how much the rich get policies for their benefit more than democracy would allow if working.
How do they do that? By making the political system a slave to their money.
So the only candidates you can usually elect are those who have the 'filters' that allow them to get the big bucks to be a viable candidate.
The marketing from big money campaigns to buy name recognition and image, to buy party loyalty, and more importantly, to buy public opinion, corrupt democracy.
How do they buy opinion? There's a huge machine - an industry of an army of mostly right-wing content creators - writers, pundits, etc. - created for spreading the ideology.
It includes enough media to get its message into the 'mainstream media'.
Since we do have a democracy, it's about fooling enough people, having them fall for bad ideology for the rich, so the rich get policies good for them and only them.
It's working great for the rich. All time high of wealth concentration, again.
It demonizes policies good for the public - and that's gone well also. Say 'socialism' and it's a way to get the public to oppose a policy. See Reagan and the speeches against 'socialized medicine' to oppose John Kennedy's plans to expand medicare, as a hired hand of the AMA who would not make as high of profits while the public got more healthcare.
I'm just waiting for Frank Lutz to come up with 'Socialized Security' to get the public to turn on that program.
The Democrats' flaw is mostly that our system is corrupt enough that many of them compromise too much with the corrupt interests.
The Republicans, though, are almost hired hands of these interests - hence every single Republican Senator putting all bills on hold until bigger tax cuts for the top 2%.
Your post is just delusional and absurd that it's the Democrats who are not doing as the founders intended for the public.
They pointed out, even then when America had less concentration of wealth than it has ever had since, that concentrated wealth and democracy are incompatible.
You are just an example of how the public is fooled, condemning those who represent the public and favoring the hired hands of the wealthy.