Rep. Michael Capuano (D-Mass.) conceded to Pressley on Tuesday evening.
Ayanna Pressley, now serving on the Boston City Council, beat the 10-term Democrat in another big Democratic upset.
Ayanna Pressley, 44, beat veteran politician Mike Capuano, 66, after mounting an insurgent campaign in MA 7th Congressional District.
It's not a sight you see every day, certainly not around Boston - a black woman mounting a plausible challenge to a 10-term white congressman from her own party, a politician with vast connections who votes the progressive line and opposes everything Trump.
Pressley's win echoes the June primary in a safely Democratic New York City congressional district where first-time candidate Alexandria Ocasio-Cortez beat a 10-term incumbent, sparking enthusiasm for progressive candidates across the United States. "America is going to be OK", Capuano said in his concession speech.
Pressley's win was the latest in a streak of victories by younger, more racially diverse Democratic candidates against established rivals ahead of the November 6 election when Democrats need to pick up 23 seats in the House of Representatives to serve as a more effective foil to Trump's agenda.
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"Oh my god. Oh my god", Pressley said through tears.
"It seems like change is on the way", Pressley told her supporters to rousing applause Tuesday night.
According to her bio, Ayanna Pressley is an advocate, a policy-maker, an activist, and survivor. "I voted for Pressley because she has and will challenge polices", she said. Pressley's positions are also very progressive.
It's a race that many establishment Democrats wanted to go the other way, with black political leaders like John Lewis, Congresswoman Maxine Waters and Governor Deval Patrick, endorsing Pressley's opponent Capuano.
Massachusetts' last Democratic primary upset came in 2014, when Seth Moulton defeated Rep. John Tierney in the state's 6th Congressional District.
Republican Gov. Charlie Baker won his party's nomination for a second term, defeating Scott Lively, a conservative minister and staunch supporter of Trump who frequently called Baker - a frequent critic of the president - a RINO, or Republican in Name Only.
Both contended that Baker's support among voters was soft and that his administration had failed to make significant strides in many areas, particularly the problems plaguing the Boston-area transit system known as the 'T'.