I think you should read up on the 'one drop rule.'
Here is the wiki entry for the concept; here is succinct essay on the topic.
I respect your opinion, and enjoy your posts, but your premise in this thread is dead wrong, and dangerously sweeps under the rug centuries of racism in America.
If a man is black enough to have trouble getting a taxi after dark, if a man is black enough to have store security trail along behind him whlie he shops, if a man is black enough to get pulled over for DWB, then he's black enough to claim the title 'black.'
Peace out, and congratulations on our great new president.