Keep clicking the guy saying it in that link. You'll hear it. Click it over and over. Don Don Don Don Don Don Don Don
Wait, I heard it that time. He's saying Dawn.
He's not. Your ear is off. I understand how you can hear him saying "dawn" but he's not. It's the same o that's in "pot" ahhhh. Keep clicking. Don Don Don Don Don Don Don Don Don Don Don Don
No, I hear it. I just say Dawn that way, too. Dawn is the word he's saying with an accent, by the way. He says it like doe-uhn.
http://www.thefreedictionary.com/Dawn
Listen to it. Doe-uhn. Doe-uhn. Doe-uhn.
Totally unnecessary elongation of the syllable with a whiny awwww sound in it.
Aaron, on the other hand, says Don like Dahhhn, with more of a shortened but still nasal twang to it. That's every bit as grating, but I understand what he's saying.