Just one thing. In my community, people joked about Bill Clinton being the first Black President because of the way they seemed to be trying to take him down. It had nothing to do with Jazz. It had more to do with impeachment, accusations of being a murderer, etc.
There aren't many in my community who are surprised by the treatment of President Obama. Unfortunately, it was expected.
Also, many Whites knew Blacks personally during slavery as well as during the reign of Mr. Jim Crow. IMHO, Whites who believed that Blacks were (insert any stereotype here), they were being willfully ignorant.