Getty Images
Now playing
02:13
Primary challenger ousts Massachusetts lawmaker
senator bill nelson 11132018
CNN
senator bill nelson 11132018
Now playing
02:03
Nelson: Scott should recuse himself
Rep. Marsha Blackburn, R-Tenn., speaks to supporters after she was declared the winner over former Gov. Phil Bredesen in their race for the U.S. Senate Tuesday, Nov. 6, 2018, in Franklin, Tenn. (AP Photo/Mark Humphrey)
Mark Humphrey/AP
Rep. Marsha Blackburn, R-Tenn., speaks to supporters after she was declared the winner over former Gov. Phil Bredesen in their race for the U.S. Senate Tuesday, Nov. 6, 2018, in Franklin, Tenn. (AP Photo/Mark Humphrey)
Now playing
01:26
Meet the Republicans who held onto the Senate (2018)
Democratic congressional candidate Ilhan Omar is greeted by her husband's mother after appearing at her midterm election night party in Minneapolis, Minnesota, U.S. November 6, 2018. REUTERS/Eric Miller
Eric Miller/Reuters
Democratic congressional candidate Ilhan Omar is greeted by her husband's mother after appearing at her midterm election night party in Minneapolis, Minnesota, U.S. November 6, 2018. REUTERS/Eric Miller
Now playing
01:33
Minorities, LGBT make history in 2018 midterms
WJLA
Now playing
02:01
Hear from the Democrats who took back the House
CNN
Now playing
01:50
Abrams vows to remain in gubernatorial race
Spectrum News NY1
Now playing
02:05
Ocasio-Cortez: This is a movement for justice
KXAN
Now playing
02:07
O'Rourke congratulates Cruz on his victory
CNN
Now playing
01:57
Tapper: This is not a blue wave
CNN
Now playing
02:11
Van Jones: It's a rainbow wave
LAS VEGAS, NV - OCTOBER 20:  U.S. Rep. and U.S. Senate candidate Jacky Rosen (D-NV) speaks during a rally at the Culinary Workers Union Hall Local 226 featuring former U.S. Vice President Joe Biden on October 20, 2018 in Las Vegas, Nevada. Early voting for the midterm elections in Nevada begins today. (Photo by Ethan Miller/Getty Images)
Ethan Miller/Getty Images
LAS VEGAS, NV - OCTOBER 20: U.S. Rep. and U.S. Senate candidate Jacky Rosen (D-NV) speaks during a rally at the Culinary Workers Union Hall Local 226 featuring former U.S. Vice President Joe Biden on October 20, 2018 in Las Vegas, Nevada. Early voting for the midterm elections in Nevada begins today. (Photo by Ethan Miller/Getty Images)
Now playing
01:45
CNN projects Jacky Rosen elected to US Senate
Additional Embargo:   Additional Source(s):    Date Shot: 11/6/2018   Shipping/Billing Info:     Description: Projects: None  Cost Center: Atlanta National Desk / 20100101   Created By: DHackett  On: 1541544461  --------------------------------------------------------------------------------
WSB;
Additional Embargo: Additional Source(s): Date Shot: 11/6/2018 Shipping/Billing Info: Description: Projects: None Cost Center: Atlanta National Desk / 20100101 Created By: DHackett On: 1541544461 --------------------------------------------------------------------------------
Now playing
00:59
Brian Kemp: Confident victory is near
2018 Elections Primary Clean path
CNN
2018 Elections Primary Clean path
Now playing
01:49
Pelosi: Tomorrow will be a new day in America
CNN
Now playing
01:36
The Democrats who might lead the House
CNN
Now playing
01:54
DeSantis thanks Trump in victory speech
KXAN
Now playing
01:44
Cruz: This election was a battle of ideas
(CNN) —  

Democratic Rep. Mike Capuano has conceded defeat to Boston city councilor Ayanna Pressley in the Massachusetts primary for his US House seat Tuesday, the latest upset to rock the Democratic Party and showcase a restive base eager for change.

Pressley’s win comes less than three months after Alexandria Ocasio-Cortez ousted the No. 4-ranking House Democrat, Rep. Joe Crowley of New York, in a primary.

In his concession speech, Capuano said the district was clearly upset with the status quo and that he shared those feelings.

“I will tell you, I’m sorry it didn’t work out but this is life and this is OK. America is going to be OK,” Capuano said, adding, “Ayanna Pressley is going to be a good congresswoman and Massachusetts will be well served.”

Unlike Ocasio-Cortez, Pressley did not argue that Capuano was too moderate. In fact, she said, the two would vote the same way. Instead, the 44-year-old Pressley – already a rising star in Democratic politics – cast the race as about Democrats’ need for a new, more assertive style in the Donald Trump era.

“This is a fight for the soul of our party. This is a fight for the future of our democracy,” Pressley said at a recent canvassing event in Cambridge. “We might vote the same way, but we will lead differently. These times require and this district deserves bold, activist leadership.”

01:05 - Source: CNN
Video shows emotional win over 10-term lawmaker

Ocasio-Cortez tweeted her support for Pressley on Tuesday night, writing “Congratulations to my sister in service, @AyannaPressley, on continuing her historic path into Congress tonight.”

Pressley is now poised to become the only black member of Massachusetts’ mostly male congressional delegation.

She’d argued on the campaign trail that systemic inequalities had worsened in a district that was once represented by John F. Kennedy and where the majority of voters are nonwhite.

“It’s about who I listen to and it’s about who I govern with. And there are a lot of people in this district who feel left out and left behind and ignored – and it’s not just women, it’s not just people of color,” Pressley told CNN in a recent interview. “It runs the gamut. And I think after a generation, the district deserves a choice.”

The race was just one of a slate of contested primaries in Massachusetts on Tuesday. Democratic Sen. Elizabeth Warren and Republican Gov. Charlie Baker – both heavily favored to win re-election – both got general election opponents.

Secretary of state Bill Galvin – Massachusetts’ longest-serving statewide official, in office since 1995 – fended off a Democratic primary challenge from Boston city councilor Josh Zakim, who conceded.

The race focused on Massachusetts’ voting laws: Galvin highlighted changes that modernized the laws early in his tenure. But those laws now lag Democrats’ preference nationally for same-day and automatic voter registration – which Zakim has pushed. Galvin has since endorsed those changes, too – but Zakim has cast him as being slow to do so.

Zakim had influential supporters, including Boston Mayor Marty Walsh and US Rep. Seth Moulton. Zakim also picked up the Massachusetts Democratic Party’s official endorsement. But Galvin, a well-known figure who has previously been the leading statewide vote-getter, coasted on Tuesday.

CNN’s Connor Spielmaker contributed to this report.