The reasons for this are obvious. It isn't because the system is rigged, it's because most people don't want the their plumber representing them in Congress. They'd much rather be represented by the lawyer. It's the same reasoning that pushes them to hire a lawyer to represent them in court instead of their plumber. It is entirely reasonable that blue collar people would choose candidates they feel are appropriately educated for the job. Now we can discuss why that assumption may be false or counterproductive, but it doesn't delegitimize the representation people choose...
...Democracies have always been plutocracies. In fact, plutocracies usually evolve into democracies. That is good, though it has it's faults. It's an extremely stable system in which the average person has a lot of freedom to live as they choose.
"Extremely stable system" .... isn't that a matter of perspective? Stable for who?
One example:
During Bush's tenure, members of Congress took $36.5 million from the banking industry. In return, bankers were granted deregulation and bailout legislation that cost the U.S. public $500 billion dollars.
Congress produces an array of protections, grants, subsidies, leases, franchises, in-kind supports, direct services, noncompetitive contracts, loan guarantees, loss compensations, and other forms of public largesse for narrow private interests, not the common person. Whether 'most people' actually realize this has nothing to do with the fact that it happens, and I would think that if you asked 'most people', they would welcome representatives whose interests are more aligned with the middle class, than with big business - by evidence I cite all the bitching and complaining people do about their taxes and or social welfare programs, etc. If people honestly understood that for every $50K they make in earned income, about $50 in tax is deducted for social welfare, while about $4000 in tax goes to pay for corporate welfare, they might change their tune.
Plutocracy is rule FOR the rich by the rich, and is no better than a king ruling over his subjects by beating them over the head with clubs. Economic force is just as powerful as physical force.