I don't understand first off, why he does it, secondly, why Black Americans aren't outraged and insulted at his attempted pandering. I know it's disgusting for me to listen to, because it's so blatantly obvious he's trying to convince his audience that he's exactly like them. But the truth is...he's not! Then listen to him speak to a room full of White Americans, and magically...the accent is gone! Insulting!
Why can't he just be the same man no matter who he's speaking to? Childish!