Listened to biden he said your not black if you don't vote for me. did he ever explain that. Can anybody?

Biden is confident that Blacks won't stray from the Democratic plantation. The plantation has cared for them and improved their lives for 50 years now. They owe their vote to the plantation. 

I heard Biden said if you voted for Trump you are not black.

That's pushing identity politics to the limit. But it seems like a lot of people would rather decide for themselves if they're black or not.

Yes. That was all discussed weeks ago.