Conservatives and racists alike aren't really interested in reality, but it's thoroughly documented that the established power brokers of the traditional black interest groups: Jackson, Sharpton, Farakhan, et al: they hated Obama. They absolutely hated the guy during his time in Chicago and when running for Senate. During the primaries for 2008, they loudly endorsed Clinton (as did Daley in Chicago).
See, what conservatives like to invent for themselves, is this thoroughly silly, easily-proven lie about how Obama was endorsed by and an obvious product of the "Chicago machine." The machine loudly, and frequently, excoriated Obama. Again and again and again. He never played their reindeer games, and they hated him for it. I guy that was very publicly shunned by the historically corrupt Chicago democratic machine was, in the mind of a brainless, ignorant, and proudly unread conservative--the central representative of that machine.
Conservatives just will never get it. If the world as it is doesn't line up with the world they want in their minds, well that's just a minor inconvenience that is easily thwarted by the simple embrasure of feels over simple observable reality.