The first time that Peater Keating hears Ellsworth Toohey speak, it's described as follows:
It was not a voice, it was a miracle. It unrolled as a velvet banner. It spoke English words, but the resonant clarity of each syllable made it sound like a new language spoken for the first time. It was the voice of a giant.
Keating stood, his mouth open. He did not hear what the voice was saying. He heard the beauty of the sounds without meaning. He felt no need to know the meaning; he could accept anything, he would be led blindly anywhere.
According to Wikipedia, Toohey was at least partially inspired by Harold Laski, and Ayn Rand even attended some of his lectures as part of her research for the book.
With that said, was Harold Laski actually as good of a public speaker as Toohey is described as being? Was Rand basing Toohey's speaking style on Laski's speaking style, or on someone completely different? Or was his speaking style not inspired by anyone in particular?