IMO, it is more than 5%. Maybe a lot more. What you see as "extreme hyperbole", many take as legitimate fact. He knows he can say what ever he wants, because the idiots will buy in 100% and intelligent people like you will rationalize and decide that he is just being hyperbolic.
This discussion started with the topic of conservatives being more supportive of Israeli policy than liberals. I gave a reason as to why that might be the case. There is no way to know whether the conservatives questioned were more closely aligned to your level of intelligence or closer to the "idiots" that you admit are out there. So, I am just suggesting something that may figure into the equation, with no real way of confirming.
As far as there being more idiots on my side, I disagree. I'm sure that you would agree that most large population centers tend to be blue, while extremely rural areas tend to be red. I know this won't go over well on this site, but, people with advanced degrees tend to gravitate toward cities and away from rural settings (for obvious reasons).
I do agree that there are plenty of gullible individuals on both sides.
https://www.washingtontimes.com/news/2018/mar/22/democrats-more-educated-republicans-pew-research-c/