Two polls out Wednesday drew lots and lots of attention for a simple reason: In Ohio and in Pennsylvania, Donald Trump is winning zero percent of the black vote.

That's, um, not good.  But, the fourth installment of our "Postcards from the Great Divide" documentary series raises an even more provocative question: What if African Americans across the board simply don't vote in large numbers for either Trump or Hillary Clinton this fall?

The film, which was made by Cynthia Readdean and Deborah Hardt, looks at that question through the lens of Jacksonville, Fla. -- a swing area in one of the swingiest states in the country.

You can catch up on all five of the Postcards below.