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So, @
noctis, you are correct. However, it can be "fixed", in the sense that politicians can be made to represent voters. The fix is to ensure that money can't influence their chances at re-election.
So, short term, have the State give every politician a fixed amount of money to spend only on their campaign (this would be cheaper for the State in the long run compared to the graft and incompetence we have now), and if they either spend the money on themselves or they accept money from other sources, they are hanged. No exceptions.
Long term, corporations are not people and cannot be allowed to influence politics, and income and wealth inequality must be brought down.