When Jimmy Carter wrote Why Not the Best, he had Plato's Republic (Cornford's translation free) in mind. The leaders he argued ought to be the best in terms of experience, knowledge, practical as well as theoretical, and ethics. Without saying so, he supported some of what Plato meant by aristocracy (rule of the best). Sadly, because of what Plato wrote about poetry in the Republic, he has gotten a bad rap.
The discussion among those who actually understand Plato over his views on poetry and writing in general is best found, I think, in the Stanford Encyclopedia of Philosophy article: