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The majority of U.S. congressmen are millionaires.
The top presidential for both major U.S. parties have been well-funded by corporations and big banks.
Candidates who challenge the interests of the wealthy end up facing difficulty from within their own party.
Politicians are financially incentivized to prioritize the interests of the wealthy. The wealthy can donate heavily to politicians that serve their interests. The middle class and the poor cannot donate on that scale, and thus it is less lucrative for politicians to attempt to serve their interests.