Politicians, Signorello said, "are the best public speakers because they face every type of audience, from elementary school to very old people."

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However, all of the politicians used their normal pitch ranges when chatting about nonpolitical subjects on talk shows. None of the candidates stretched their frequencies or loudness in this situation, according to Signorello.

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Sanders usually speaks to audiences made up of people of a wide variety of ages, cultural backgrounds and genders, Signorello said. He has to adjust his speech often because he wants to be liked by everyone.

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