Two challengers look to unseat the longest sitting city councilor in September's preliminary election for District 4, which includes parts of Dorchester, Mattapan and Jamaica Plain. We talked to both Andrea Campbell and Terrance Williams. Councilor Charles Yancey did not respond to several interview requests. A fourth candidate, Jovan Lacet, will be listed on the Sept. 8 preliminary ballot, but Lacet says he has dropped out of the race.

Andrea Campbell of Mattapan is a newcomer to the race for public office after serving as deputy legal counsel for Gov. Deval Patrick. Terrance Williams of Dorchester is back after an unsuccessful 2013 run against Yancey. Read more.