Check out this preview trailer for an upcoming independent documentary feature film directed by Kevin J. Williams, titled Fear of A Black Republican, which asks why there aren't many Black Republicans, and how that fact influences/affects the current 2-party political system in the USA.
There's a much longer synopsis of the film, which includes talking heads like Cornell West and Tavis Smiley, on its website HERE. While there, you'll also find an FAQ page that answers questions about the film, like how it was financed, what its objective is, the origins of its title, and why its filmmakers are white, given the subject matter.
The film is now available for purchase on DVD, on its website, for $22, if you're curious enough after seeing the below trailer for it. I'm an anarchist, so... :)