Because he didn't graduate at the top of his class, with honors, and 3 degrees, after growing up in a Jewish ... and Puerto Rican ... community, after never never meeting the man who invented insulin, never being a civil rights activist, or being arrested in Africa while attempting to march with Mandela ... like Joe?
There were three scientists involved in the development of insulin. You should know that by now. I have posted several links. I don't know much about neighborhoods in Delaware.