Sen. Brian E. Frosh (D-Montgomery), left, confers with a Senate colleague. (AP Photo/Patrick Semansky)

Sen. Brian E. Frosh (D-Montgomery) on Monday picked up an endorsement of his bid for Maryland attorney general from the state’s leading gay rights lobby.

In a statement, Carrie Evans, executive director of Equality Maryland, said Frosh has been “a firm ally and leader” on issues affecting lesbian, gay, bisexual and transgender Marylanders.

“He has the maturity, experience and commitment to be an effective advocate for the LGBT communities of Maryland as our next attorney general,” Evans said, in particular citing Frosh’s work this legislative session on a bill that created protections for transgender people in the areas of jobs, employment and housing.

Frosh helped shepherd the bill through the Judicial Proceedings Committee, of which he is chairman.

Frosh faces Del. Jon S. Cardin (D-Baltimore County) and Del. Aisha N. Braveboy (D-Prince George’s) in the June Democratic primary for attorney general. They are seeking to succeed Douglas F. Gansler (D), who is running for governor.

Equality Maryland previously endorsed Lt. Gov. Anthony G. Brown (D) in the governor’s race.