Not the content, the voice inflection and syncopation. He went through a period where he would default to ghetto-inflection. I'm thinking somebody got onto him about that and they floated Cosby to him as a model for a non-ghetto nigger.
[ame="http://www.youtube.com/watch?v=q6wNYZFX9RY"]YouTube- Pr. Obama Remarks on Jobs (2) and the Economy - Holland Michigan[/ame]
[ame="http://www.youtube.com/watch?v=XBqY6cJD3CE"]YouTube- Bill Cosby- Dentists[/ame]