Sen. Brian E. Frosh (D-Montgomery), left, speaks with Sen. Joan Conwa (D-Baltimore) in 2011. (AP Photo/Patrick Semansky)

Maryland Sen. Brian E. Frosh (D-Montomery) plans to officially launch his campaign for attorney general with an e-mail to supporters Tuesday in which he pledges to be “the people’s lawyer” if elected, according to excerpts shared with The Post.

“In a world where powerful special interests seem to get all the breaks, too many Marylanders feel like their voices aren’t being heard,” Frosh says in the e-mail. “They want to know they’ve got an advocate who will fight for them. They want to know someone has got their backs. That’s why, after much encouragement from Marylanders across the state, I’ve decided to run for attorney general.”

Frosh, chairman of the Senate Judicial Proceedings Committee, has been gearing up for months to run for statewide office. He announced an exploratory committee for attorney general last fall that included several prominent names in the state’s Democratic establishment.

Frosh could face a crowded Democratic primary. Last week, Del. Jon S. Cardin (D-Baltimore County) formally kicked off his campaign with a Web video. Others eyeing next June’s primary include Del. C. William Frick (D-Montgomery) and Del. Aisha N. Braveboy (D-Prince George’s).

They are running to succeed Attorney General Douglas F. Gansler (D), who plans to announce his 2014 bid for governor in September.

“We need an attorney general who will fight for justice and equal treatment for all Marylanders; someone who knows that protecting our children and fighting for safe communities is the first step in creating opportunity for all; someone who will protect consumers and seniors from those who try to defraud them; and someone who will enforce laws that protect our environment; and someone who will work to prevent discrimination so that all Marylanders have the opportunities they deserve,” Frosh says in his e-mail.

He also invites supporters to join him in September for a series of campaign events where he says will talk more about his plans.