The field of candidates looking to succeed Martha Coakley as Massachusetts attorney general is growing. State Representative Harold Naughton Thursday became the second Democrat to make a bid to become the state’s top prosecutor.

Naughton’s announcement comes three days after Maura Healy, who worked under Coakley in the attorney general’s office, launched her campaign. Naughton chairs a committee that is crafting a gun control bill in the wake of the school shootings in Newtown, Connecticut.  In a campaign web video, the Worcester County Democrat highlights his focus on public safety.

“I’ll stand in your corner to fight crime and fraud, to get illegal guns off of our streets, to keep our community safe, and be an advocate for working men and women, honest businesses, and the protection of our environment,” Naughton says in the video.

No Republicans have announced a run for attorney general, but among the possible candidates is Senate Minority Leader Bruce Tarr of Gloucester. Tarr says he first heard his name floated for the position in news reports. 

“I’m not ruling out anything at this point, I think that would be a mistake,” Tarr says, “but I’m also not shifting my focus from the very real issues we’re trying to deal with on Beacon Hill right now.”

The attorney general position will be vacant as Martha Coakley looks to become the state’s next governor.