"He speaks from the heart" is the biggest BS reason for voting for someone.
Honestly its not. Its basically the polar opposite and major flaw of hillary. Here's whats going on, trump, according to his ghostwriter has the ability to genuinely... legitimately believe something (he thinks, says, etc.) if he chooses to. He'll find any reason and rational and buy in to it completely. Odds are he just doesnt overthink things to help him speak "truth". Truth in the sense he has full conviction in his beliefs and what hes saying most of the time.
When it comes to unconscious communication this is powerful fucking stuff. It carries with it a form of confidence (some will view as arrogance) most people dont have.
Hillary by contrast probobly over analyzes things. Shes got a silver tongue but many times theres unconscious incongruency and thats what people pick up on when they say shes cold, fake, a liar, etc.
In her mind things are probobly more complex and shes giving the best answers she can while fully knowing its not the full story. Thats not to say shes hiding the truth, but as just about all of us know situations can be complicated with lots of factors. Her speeches many times feel political or manufactured simply because they are. If anyone has done toastmaster or public speaking you know how much of a factor emotion and conviction are when talking to an audience.
This is also why trump doesnt like teleprompters, it fucks with his ability to stay aligned with what he feels is true, which impact the feeling the audience get.
Many may not like it and say we should be rational beings and listen to whats being said but the most powerful aspects of communication are unconscious. Its easy to see by just paying attention to interactions between sexes. Or when talking and dealing with children, etc.
