First, I agree propaganda is not always false, but if you read a post I made earlier, you'll see that the reason's it's a problem is that it controls narratives and creates curated biases that give people inaccurate beliefs (e.g. by focusing heavily on single small issues to further a controversy). For example, consider that Russia created fake BLM-related twitter accounts to stoke tensions and drive controversy on both sides of the issue: http://faculty.washington.edu/kstarbi/examining-trolls-polar.... This is somewhat different, less propaganda and more astroturfing, but the effect is the same regarding propaganda: to direct the narrative into something convenient for those behind the strings.

Outlawing political advertising is not what I propose. I believe propaganda is different in its intent: in my opinion direct disinformation or dishonesty (with intent) would be a sufficiently high barrier, given that it would require a high barrier of proof that the supporters were seeking to manipulate opinion with lies. This would ensure nobody would be prosecuted except in the most egregious of cases. I also believe this could be a valid exception to the first amendment in the same vein as libel or slander: spreading false information, with intent, possibly for personal gain. The parallels certainly exist.

Furthermore, I believe I would be just outraged if Hillary did this, and I think this is a pointless distraction. I didn't vote for her and I know that she also had her own shady internet propagandists working too. I think we should do our best to make sure political discussions happen organically, from real people.