DISCLAIMER My opinion is based only on my experiences.
I am a black female graduating with my degree in CS in the Spring. I have been fortunate enough to have completed a couple of internships during my time at school. From my experiences, color doesn't matter...knowledge does.
With that being said, I can understand other black student's need to find a mentor or role model of color. They're out there. I met a really cool developer from GaTech that thought me a lot at my last internship. Of that experience, I felt as though he wasn't guiding me because I was also black. He didn't care. It was all about performance.
I also agree with the post before mine that lack of exposure to technology in our youth is the main reason for less black developers.