Is this now the model for how to win presidential campaigns?

I just came across this old text on propaganda:

All propaganda must be popular and its intellectual level must be adjusted to the most limited intelligence among those it is addressed to. Consequently, the greater the mass it is intended to reach, the lower its purely intellectual level will have to be.

The more modest its intellectual ballast, the more exclusively it takes into consideration the emotions of the masses, the more effective it will be. And this is the best proof of the soundness or unsoundness of a propaganda campaign, and not success in pleasing a few scholars or young aesthetes.

The art of propaganda lies in understanding the emotional ideas of the great masses and finding, through a psychologically correct form, the way to the attention and thence to the heart of the broad masses. The fact that our bright boys do not understand this merely shows how mentally lazy and conceited they are.

Once we understand how necessary it is for propaganda to be adjusted to the broad mass, the following rule results:
It is a mistake to make propaganda many-sided, like scientific instruction, for instance.

The receptivity of the great masses is very limited, their intelligence is small, but their power of forgetting is enormous. In consequence of these facts, all effective propaganda must be limited to a very few points and must harp on these in slogans until the last member of the public understands what you want him to understand by your slogan. As soon as you sacrifice this slogan and try to be many-sided, the effect will piddle away, for the crowd can neither digest nor retain the material offered. In this way the result is weakened and in the end entirely cancelled out.

The function of propaganda is, for example, not to weigh and ponder the rights of different people, but exclusively to emphasize the one right which it has set out to argue for. Its task is not to make an objective study of the truth, in so far as it favors the enemy, and then set it before the masses with academic fairness; its task is to serve our own right, always and unflinchingly.

—Mein Kampf

Should we just concede that in an electoral system where the way to victory is through mass appeal, this approach is most effective?

Are the “bright boys”, “scholars and young aesthetes” (aka “elites”) misguided in thinking that laying out a “scientific” (i.e rational, fact-based) case is the way to go? Could it be that this has never been the case, and we should no longer even entertain that idea?