Grossman received strong support from the LGBT community during his campaign, including the endorsement of all five LGBT state legislators: State Senator and Majority Leader Stan Rosenberg, Representative Denise Andrews, Representative Elizabeth Malia, Representative Kate Hogan, and Representative Sarah Peake. Grossman's broad base of support included endorsements by unions such as the United Union of Roofers, Waterproofers and Allied Workers Local 33 and Teamsters Local 122 as well as advocacy organizations such as Mass Retirees and the Coalition for Social Justice.