So what do you then do about someone not the candidate who wants to buy airtime to support the candidate's position? In order avoid the "money problem", you'd have to deny that.
Which means I couldn't personally buy a TV ad during the election cycle to express my views.
So, because of perceived abuses, we restrict the rights of everyone.
I'm sorry, but that's not the way rights work. It's hard to protect them, because it means accepting things you might not necessarily like, but the alternative is opening the door to more and more limits, all, I'm sure, for the best of reasons and with pure intentions. And, in the end, we find that we've given away everything.