I don't see that as a very direct answer to the question I asked.
Your question included a false assumption (that commercial advertisers are prohibited from making false claims). I pointed out that they're only prohibited from making some false claims, and I pointed you to a fine essay on factcheck.org that addresses the broader question of prohibiting lies in political ads.
I would add to that answer another point: it's rarely possible to separate a lie from something that is technically true. For example, Jim Talent ran an ad here once that said he voted to increase the minimum wage x number of times. Technically it was correct, but only because he voted for some larger piece of legislation that included a minimum wage increase (not all of which passed into law). In fact, if his claim were that Jim Talent is in favor of increasing the minimum wage, that would be a lie. Yet that's what the ad implied. If you crafted a law, how could you go about distinguishing lies from false implication or spin?
[ETA: The factcheck essay makes this point too. In states that have tried anti-lying laws for political ads, they seem to be ineffective. They're way too easy to get around in ways like the example I gave.]
Shall we take a look at the numbers of people in the US who reject evolutionary theory in favor of the notion that the universe was created around six thousand years ago? Who believe in Bigfoot, or UFOs, or ESP? Is it not a central premise of the skeptical community as a whole that many of the beliefs embraced by so many without evidence are not merely silly, but potentially dangerous?
These questions are irrelevant. Should we restrict the speech of any of these people or organizations?
Your careful use of escape clauses like "probably" and "smallish" appears to have been prudent:
I think you're unaware of the difference between the word "television" and "broadcast". Most TV today is not broadcast television. (I'm one of the throwbacks who still gets his TV from the broadcast signals. Most people get it from a cable or satellite dish, neither of which is broadcast TV.)
We're talking about interpretations here. If only one correct interpretation were possible, we would not be having this discussion at all. And I still say that prime broadcast slots are a distinctly finite commodity.
I think you're wrong. The fact that people can disagree about the interpretation of the law is a good rationale for establishing a judicial authority.
At any rate, free speech is not a finite commodity, and one person's exercise of it does not restrict another's. You're just wrong in thinking about it that way. If so, each person would be able to demand an equal allotment of that commodity (including, I suppose equal space in newspapers, equal air time on TV and radio, etc.) And again, then freedom of the press could only be construed as each person having a right to a printing press that is no better or worse than that of any other person.
But that's not how rights work. Rather, the right to free speech is a restriction on the authority of government.* When the constitution had been drafted, the bill of rights didn't exist, and there was some controversy over whether they were necessary or actually a danger. The idea was that the constitution describes a limited government, and that implies all the rights of the people. (In other words, rights are very much equal to limits on government.) When the list of rights was added to get the constitution ratified, it had to include the 9th amendment which makes this point clear (this enumeration of rights isn't the whole story--government is still limited and all other rights are still reserved).
*And that really is the question the Citizens United case brought to the Supreme Court--does Congress have the authority to restrict speech in this way.
FWIW, Citizens United doesn't stand alone as a quirky landmark case as many think. The McCain Feingold Act was the subject of 4 or 5 other Supreme Court cases, and in only one of them were all the parts of the law being challenged sustained.