Voters in most of Boston, about half of Cambridge, and Somerville, Chelsea and Everett will have a rare choice this September. A Democratic primary will be held in the state's 7th Congressional District.

Boston City Councilor Ayanna Pressley says she's running for the seat against incumbent Congressman Michael Capuano.

Radio Boston's Meghna Chakrabarti spoke to both Pressley and Capuano and gave Morning Edition this report.