Then you are more than welcome to blow as much money as you'd like on your favourite candidate! And since it's on Youtube, noone is "forced" to watch your video, they can always switch to something else.
However, TV and cable channels (as well as press) should have strict equality rules when it comes to candidates for a given period until the elections. What good will your ten million dollars video do on CNN when they are legally obligated to give every candidate the same amount of air time? But of course, you could skirt around it, and make your video subtly hint about said candidate, never mentioning him. But if countries with civil law can manage to make that work when it comes to respecting the spirit of the law, I have no doubt a country with common law will have no issues realizing that this is quite obviously violating the spirit of the law.
There is absolutely no principled difference between youtube and cable channels that I can see; people are easily able to "switch to something else", as you say, in both cases. Or indeed, shut off their TV. Doubly so if we're talking long-form content like that in the Citizens United decision, as opposed to 30-second ad spots.
Why do you think that there is a difference here?
> But if countries with civil law can manage to make that work when it comes to respecting the spirit of the law
For what it's worth, said countries typically have nothing comparable to the constitutional free speech protections the US has, and have no problem with the government imposing all sorts of speech limits that would get laughed out of court in the US.
And as mentioned elsewhere in this thread, speech that is not "for" any particular candidate but "against" a particular candidate is not trivial to apportion in an "equal time" regime.
However, TV and cable channels (as well as press) should have strict equality rules when it comes to candidates for a given period until the elections. What good will your ten million dollars video do on CNN when they are legally obligated to give every candidate the same amount of air time? But of course, you could skirt around it, and make your video subtly hint about said candidate, never mentioning him. But if countries with civil law can manage to make that work when it comes to respecting the spirit of the law, I have no doubt a country with common law will have no issues realizing that this is quite obviously violating the spirit of the law.