Maryland Democratic attorney general hopeful Brian E. Frosh on Friday picked up the endorsement of the League of Conservation Voters, which praised the Montgomery County senator as a “long-time environmental champion.”

“Marylanders have counted on Senator Frosh to clean up the Chesapeake Bay and local waterways, fight climate change, make our air safer to breathe, reduce trash and toxic pollution and conserve open spaces,” said Karla Raettig, the organization’s executive director. “Attorney General Frosh will bring that same dedication and passion to protect all Maryland families.”

Frosh, the chairman of the Senate Judicial Proceedings Committee, faces three delegates in the June Democratic primary: Aisha N. Braveboy (Prince George’s), Jon C. Cardin (Baltimore County) and C. William Frick (Montgomery).

They are vying to succeed Attorney General Douglas F. Gansler (D), who is running for governor.

The endorsement was the first of the 2014 political cycle offered by the Maryland League of Conservation Voters.