[isleyaardvark]

His success is built on racism. As effective as they can be, people don't generally describe the person who whips up a violent mob as charismatic.

[ben_w]

They have called it that since the word was coined in the original ancient Greek, and the skill itself seen as a divine gift: https://en.wikipedia.org/wiki/Demagogue, https://en.wikipedia.org/wiki/Charisma

It's part of why the ancient Greeks thought government came in cycles, with democracy being only a transitory state.