Here's my take on this, and I'm a Mixed Puerto Rican.
I don't go by the one drop black rule. I go by phenotypes. There's alot of people with Black blood in them that don't look Black.I don't have a problem calling Obama or Halle Berry Black, because they look Black. But you got mulattos that don't look Black. People like
Drake, Kris Humphries, Vin Diesel, Derek Jeter.
Alot of people call me Black. While I've always acknowledged my Black ancestry, I never called myself Black because when I look at myself, I don't see a Black person
Here's another reason why I don't follow the one drop Black rule; Did you guys know that in Puerto Rico and other Latin American countries, they have a one drop white rule? If you have enough white ancestry in you, you could be considered white? Or at the very least a Mulatto. Sounds stupid right? And I agree that it's stupid. Can you really say that a one-drop white rule is stupid and but that a one-drop black rule is perfectly fine?
In the end though, if a bi-racial person identifies as Black, I won't object it or make a big deal out of it. Even if said person does not look Black in my view