I would say Republicans don't underestimate Murcan intelligence. They more accurately gauge just how gullible Murcans are when it comes to believing their lies about the economy, queerfolk, immigration, taxes, and services.

Economically, every single Republican POTUS has fucked the economy for the little guy, why would you believe this one would be different?

Queerfolk make up maybe 10% of the population, how are they possibly oppressing the other 90%?

Immigrants do all the jobs that most Murcans won't touch like agricultural and construction. How can it help average Murcans to have more expensive food and housing?

For taxes and cuts to services, it's long been proven that tax cuts for the wealthy do not create jobs or benefit society at large. The accompanying cuts to services do far more harm than good.

Republicans mislead the population in order to get you to vote with your emotions.

Democrats don't seem to think that this works and refuse to stoop to their level, when it is at exactly this level they need to fight if they want to have any hope of winning an election. Call them names, make up shit that doesn't exist, taunt them about how they're old and tired, and literally deep throat a microphone. Whatever the current reality teevee POTUS is doing.

You can't beat those fuckos with facts or reason.