I was thinking about Barack Obama and being multiracial last night, and this documentary came to mind. But I couldn't remember the name of it until I literally had one of those three a.m. Eureka! moments where I sat bolt upright in bed and went, "Race: The Power of an Illusion!!!"
I could only find this one bit on YouTube, and wanted to write more on the issue but really kind of don't feel like it now. But, watch it anyway. Highly recommended.