The usual explanation of the extent of a person’s individual rights is that your rights extend to the point where they interfere with another’s rights.
So, if in Richnond, California, the Chevron corporation buys up all the billboards and air time on radio, television and other media to support candidates who will be friendly to them; are they not infringing on the free speech rights of the other candidates who will be unable to advertise no matter how much money they have?
Just asking.