Because aspiring politicians families need money too
Even if they are not elected, funds are still moved around by 'mysterious' means, be it state side, or even internationally. It must be washed. If the donor does not want to be seen, this is how it's done.
This way the show continues, though the person of interest is highly unlikely to be elected, millions of dollars are funneled through shell companies as well as legitimate corporations.
Ask, where do all those funds end up. Say a public offering to sell shares, to 'accredited' investors, means the public cannot see who 'invested'. Yet could also be considered 'donations' or 'investments', up springs companies to absorb said liquid, family, friends and acquaintances. Advertising companies, and the likes reap rewards, many of which are again, associated with said political persons.
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Disclaimer: Everything I post is opinion and is not to be taken as investment advice. You make your own decisions based on your own judgement. Do your own DD = 'Due Diligence' = Your trade, Your responsibility.