In the US check your state laws!!
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A more textbook example of a violation of the first amendment, and the reason why the first amendment is necessary in the first place, would be hard to find.
If the person has money they still can buy billboard, commercials, etc if they have an opinion, so they still have their freedom of speech right. I don't remember the amendment where the right to spend money on your own election is...
If I have seen farther than others, it is because I was standing on the shoulders of giants. -- Isaac Newton