I've been surprised that his audience has as many Trump supporters as it apparently does.

You shouldn't be. In this very podcast, though he doesn't address the question directly, he gives reasons why smart people might support Trump (even if supporting Trump isn't itself smart).

I've been following the US primaries etc fairly closely (as a Brit) and it's interesting. In the early days I was trying to decide whether to try to make money off of Trump winning the candidacy (as I thought he probably would) but then after watching him speak a few times, I formed almost exactly the same impression that Sam describes here: a buffoon with nothing of substance to say on any topic whatsoever. Repetitive, almost incoherent, rabidly narcissistic. [I concluded (lol) that Trump had little of winning because the upper echelons of the Republican party would unite against him.]

Now you have to understand that according to most people's standards I'm pretty "far right". To me, ideas like banning Muslim immigration (not the same thing as banning Muslims from entering the country!) banning the construction of mosques, protecting borders with physical barriers and (if necessary) deadly force, are just common sense. I'm also a "race realist" which will tell you all you need about my stance on political correctness.

So I'm exactly the kind of person who one might expect to be a Trump supporter. And I sort of was - I was slowly forgetting my initial impression of Trump and being drawn into the alt-right whirlpool. To the extent that I'm representative of a 'type', I just have to say: Sam is doing God's work - laying out exactly why supporting Trump is insane in terms that make sense even for people who hate political correctness and the spread of Islam.