Mike Capuano won this seat in 1998 when he defeated 9 Democratic opponents with 22% of the vote. He was never seriously challenged after that until this year — and now 80 minutes after polls closed he has conceded defeat to Ayanna Pressley.

— Steve Kornacki (@SteveKornacki) September 5, 2018

So this district did follow the same pattern that AOC won on, namely an incumbant who had never been challenged seriously for years.