"I want to be attorney general," Frosh said in an interview. "If it looks like the stars are aligned, that's what I'm going to do."
Frosh said that in the past two days, he's been calling friends and colleagues and "getting a great response." In the "next few weeks," he will likely announce an exploratory committee.
It is widely believed that current Attorney General Doug Gansler will run for governor in 2014.
Frosh, 65, has long led the Senate's progressive wing, supporting same-sex marriage, ending the death penalty and an assortment of pro-environmental causes. He's also worked on consumer and privacy laws.
He has chaired JPR since 2003, and should he run, he'll leave a vacancy at the helm of the powerful committee. Baltimore Sen. Lisa Gladden is the vice chair, though should she be promoted, it would mean Baltimore would have two chairmanships and Montgomery County would have none.
Baltimore Sun reporter Michael Dresser contributed.