Robert F. Kennedy Jr. talks the way he does primarily because he has a neurological voice disorder called spasmodic dysphonia. This condition causes involuntary spasms in the muscles that control the vocal cords, resulting in a voice that sounds raspy, shaky, strained, or breathy. It gives his voice a distinctive quiver or raspiness, which can make his speech sound uneven or strained. He has spoken publicly about this condition and has managed it with treatments like botulinum toxin (Botox) injections to the vocal cords. Kennedy has mentioned that despite the challenges, the neurological nature means the more he uses his voice, the stronger it tends to get, though he dislikes how it sounds.

Additionally, his speech style includes a measured pace with strategic pauses, rhythmic delivery, and vocal modulation. These elements, combined with his unique vocal quality from the disorder, contribute to a distinctive speaking style that can convey authenticity, gravitas, and emotional expression. He uses these speech techniques effectively to emphasize key points, connect emotionally with listeners, and enhance persuasiveness. His voice has evolved over time due to his experience and practice in public speaking, further shaping how he talks.

In summary, the way RFK Jr. talks is influenced both by his neurological voice condition, spasmodic dysphonia, and his deliberate rhetorical and vocal techniques that together shape his unique speaking style.