I too love idealism, but I have to wonder just how broken things have to get before people begin to accept that a thing that sounds good in theory just doesn't work right in the real world?
In theory, unregulated free markets are always self-correcting. In theory, socialism works great. In theory, uninhibited free speech is one of the pillars of a free society.
So if we start seeing torrential downpour of misleading ads with a "paid for" line that's a total lie, making it harder still for people to figure out what positions actually do belong to a candidate, will that be broken enough then?
I mean, we've already got pharmaceutical advertising, massive media conglomerates muddying the waters, and a huge rise in hate speech that's dehumanizing people to the extent that they're being mass-murdered.
We already accept a number of reasonable limits on speech. Society hasn't imploded yet, at least not for that reason, anyway. I think you've gotta do better here than "it's a slippery slope".