Cambridge City Councilman Nadeem Mazen (D) announced that he will join the individuals in the open seat Democratic field attempting to succeed retiring Rep. Niki Tsongas (D-Lowell). Mr. Mazen was openly considering challenging Rep. Mike Capuano (D-Somerville) in the 7th District Democratic primary but is now changing course. None of Cambridge is included the 3rd District, so Mazen has no constituency in that particular CD. Four other Democrats are already in the race, including Dan Koh, the former chief of staff to Boston Mayor Marty Walsh (D), and state Sen. Barbara L’Italien (D-Andover). Republican businessman Rick Green is the lone member of his party to declare his congressional candidacy. Democrats are favored to hold the seat.
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