She joins a number of other black women who've won their primaries this year, including Stacey Abrams, who's running for governor in Georgia, Lauren Underwood, running for a congressional seat in IL, and Jahana Hayes, who's also running for a seat in Congress from CT.
Quentin Palfrey has won the Democratic primary for lieutenant governor in MA, ending comic Jimmy Tingle's bid to shift from political humor to political office.
"It seems like change is on the way", Pressley told her supporters to rousing applause Tuesday night.
In a video posted by her close friend Jesse Mermell, Pressley stands up in seeming disbelief.
Pressley was long considered the underdog.
Pressley, a Boston City councilor, was heavily outspent and making her first run for Congress but that made little difference as she rode a wave of momentum to victory.
The 44-year-old's upset over a 10-term incumbent congressman underscores the shift underway in a Democratic Party whose base is seeking younger, more diverse candidates who embrace progressive policies.
Apple Announces Event on September 12, New iPhones Are Expected
The Apple iPhone XS and Apple Watch Series 4 will be unveiled during a special event at Apple's spaceship campus on September 12 . While two iPhone models will feature an OLED panel, one would be a comparatively cheaper smartphone with an LCD display.
Pressley was endorsed by fellow congressional upstart Alexandria Ocasio-Cortez. "Ayanna Pressley is going to be a good congresswoman".
Like Ms. Ocasio-Cortez's challenge to Rep. Joe Crowley, Ms. Pressley was looking to unseat a white male who'd represented for 20 years a district that was now mostly non-white.
Sen. Elizabeth Warren, Massachusetts Democrat, cheered the outcome on Twitter on Tuesday night. She'll face Geoff Diehl, a state representative who served as co-chairman of President Donald Trump's 2016 campaign in the state and defeated two other Republicans for his party's nomination.
Rep. William Keating easily fended off a challenge from his left in his bid for a fifth term.
Ayanna Pressley is heading to the US Congress in the latest remarkable upset in this year's primaries in advance of the November midterm elections. 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 USA history.
Neither Gonzales nor his primary opponent Democrat Robert Massie, a longtime political and environmental activist, was well-known outside party activist circles.