The win means Lynch, first elected in 2001, is virtually ensured another two-year term in the 8th Congressional District.
Other Massachusetts Democratic incumbents held off challengers.
According to her bio, Ayanna Pressley is an advocate, a policy-maker, an activist, and survivor.
A survivor of sexual assault at Boston University and during her childhood, Pressley has been a vocal supporter of victims of sexual violence since long before the #MeToo movement. Michael Capuano in the Democratic primary for the 7th Congressional district in MA.
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But both Pressley and Capuano admit there's likely no difference between them in terms of the way they'll vote in Congress, and moreover, neither one has expressed outright opposition against Democratic leader Nancy Pelosi.
Pressley is the first woman of color ever to serve on Boston's City Council, and is set to break another barrier, becoming the first woman of color to serve in its congressional delegation.
Pressley is poised to become the state's first black woman in Congress. She and Ocasio-Cortez both defeated older, white congressmen who were reliable liberal votes, but who didn't look like many voters in their districts.
Democratic U.S. Sen. Elizabeth Warren sailed through her primary unopposed.
Rep. William Keating easily fended off a challenge from his left in his bid for a fifth term. And black politicians in three states - Florida, Georgia and Maryland - have won the Democratic nomination for governor, a historic turn for a country that has elected just two black governors in US history.
Keating will take on Republican Peter Tedeschi in November. "We believe that people in public life can, and should, debate the issues respectfully and seek common ground whenever possible".