It was a no-sweat primary election for Massachusetts Attorney General Maura Healey, who faced no opposition Tuesday in winning the Democratic Party’s nomination for governor in the November election, where she will face Geoff Diehl, the Trump-backed Republican candidate.

But for Andrea Campbell, who most recently represented Dorchester and Mattapan on the Boston City Council, a tough campaign ended with her winning her party’s backing for attorney general by soundly defeating Shannon Liss-Riordan in Tuesday’s primary.

At her victory night party inside the Reelhouse restaurant in Quincy’s Marina Bay neighborhood, Campbell called her campaign “people powered,” saying, “For all those who have felt marginalized, this victory is for you. For all those who have felt left out and left behind and undervalued, this victory is for you.”

She will face trial attorney Jay McMahon, the Republican nominee who ran and lost the AG election to Maura Healey in 2018.

Former Obama administration official Quentin Palfrey was also on the ballot, but he dropped out last week and endorsed Campbell.

With nearly 88 percent of Massachusetts precincts reporting by the Reporter’s press time, Campbell had picked up 315,420 votes (50.6 percent) to Liss-Riordan’s 212,517 (34 percent), and Palfrey’s 96,400 votes (15 percent).

The nominee won the city of Boston, receiving 69 percent of the vote to Liss-Riordan’s 23 percent, a striking number given that Liss-Riordan had been endorsed by Mayor Michelle Wu, US Sen. Elizabeth Warren, and multiple unions.

In a key move during her campaign, Campbell snagged the endorsement of Maura Healey, whose decision to run for governor opened up the attorney general’s seat she had held since winning it in the 2014 election cycle.

A year later, Campbell, who had served as deputy general counsel to Gov. Deval Patrick, toppled longtime Boston City Councillor Charles Yancey. She went on to serve as Council president, the first African American woman to serve in that position.

Before Marty Walsh left the mayor’s office in early 2021 to take the Labor Secretary’s post in the Biden cabinet, she launched a mayoral campaign in 2021, and came in third, behind Wu and then-Councillor Annissa Essaibi George in the preliminary election.

On Tuesday night, Campbell thanked various organizations, such as the Environmental League of Massachusetts and several unions, including SEIU 1199, with helping power her to victory. A super PAC with ties to the Environmental League spent tens of thousands of dollars to support her campaign, drawing criticism from the Liss-Riordan camp, which called them “corporate interests.”

The Liss-Riordan campaign, meanwhile, drew criticism for its candidate sinking more than $9 million of her own money into the race.

Other contested statewide races included:

• Lieutenant governor – Salem Mayor Kim Driscoll won a three-way race with Longmeadow state Sen. Eric Lesser and Acton state Rep. Tami Gouviea;

• Auditor – Methuen state Sen. Diana DiZoglio beat out public transit advocate Chris Dempsey;

• Secretary of State – Longtime incumbent William Galvin pushed back a challenge from NAACP head Tanisha Sullivan.

All will face Republicans in the fall, with Healey, the Democratic nominee for governor, facing Geoff Diehl, the Republican nominee who was backed by former president Donald Trump, at the top of the ticket in the Nov. 8 election.