Here's the racially driven movie written by Professor Derrick Bell, the president's Harvard professor and mentor. He made reading Bell a requirement in his (Obama's) classes and stayed friends with him all his life. Bell visited the White House at least a few times before his death.
The movie is based on a futuristic scenario where aliens offer to clean up the planet and supply endless clean energy...only if they give all the black people over to the aliens to be slaves.
It's absolutely horrible but the significance is the theory behind it and the close association between the President and Derrick Bell.