How would Oprah do with black women?

[DINGO Joe]

Dems are so close to being maxed out with black women that any swings would be small in absolute terms. The real benefits would be volunteering and turnout. 

This is correct, however turnout would be huge--practically 100%.  Additionally, no black woman would die between the time Oprah announced her run and the opportunity to cast their vote for her.  Millions of elderly black women would literally will themselves to live, for years if needed, to cast the vote for Oprah.