Shannon Liss-Riordan, the labor attorney running for state attorney general, continues to rack up union support. On Tuesday, Liss-Riordan’s campaign rolled out the support of SEIU Local 888, which represents 8,000 state, municipal and education workers in Massachusetts.

"Shannon Liss-Riordan's dedication to fighting for civil rights, holding corporations accountable and protecting workers makes her the strongest candidate for Attorney General, and our choice for the job," Tom McKeever, SEIU Local 888’s president, said in a statement. The union is based in Braintree.

In her own statement, Liss-Riordan, a Brookline resident, noted that the union’s members have been “on the frontlines of this pandemic, caring for our veterans, taking care of seniors and ensuring that critical government services continued to function at such a difficult time."

Twenty-six other unions have endorsed the labor attorney, including Dorchester-based Plumbers and Gasfitters Local 12, Sheet Metal Workers Local 17, Plasterers and Cement Masons Local 534, and Pipefitters Local 537; and Teamsters Local 122, OPEIU Local 453, and Ironworkers Local 7, all of South Boston.

Two other candidates are running for attorney general as Democrats, an open race due to Maura Healey, the current attorney general, running for governor. They are Andrea Campbell, a former legal aide to Gov. Deval Patrick who represented Dorchester and Mattapan on the City Council between 2016 and 2021, and Quentin Palfrey, a voting rights lawyer who ran for lieutenant governor in 2018.

Campbell was endorsed by US Sen. Ed Markey earlier this month.

The winner of September’s Democratic primary is expected to face off against Republican attorney Jay McMahon of Cape Cod, who challenged Healey in 2018.