the worst wealth gap this the country. mr. adams is a local author and historian who leads walking tours of some of boston's most historic black neighborhoods. >> your worth is told to you every day without them telling you, you aren't as bostonian, and the only reason it is is because you were born in this skin. it is insane. >> reporter: and no black candidate has ever won in a city-wide election. when mayor marty walsh resigned to become joe biden's labor secretary, a diverse slate of candidates jumped into the wide open race, the top six all identifying as people of color, three of them black. kim janie, john barrows, and district 4 city councillor andrea campbell who was endorsed by the "boston globe" but none of the three made it through the primaries. >> boston was on the cusp of possibly for the first time