Salem Mayor Kim Driscoll (D) announced Tuesday morning they she will not run for the Senate seat held by Sen. Scott Brown (R-Mass.), citing the work that remains in front of her in her current post.
"I have concluded that I cannot enter the race at this time," Driscoll said in a statement Tuesday morning. "As I worked through this decision making process, it became increasingly clear to me that at present there is much to do here in Salem."
Driscoll's decision is the latest signal that the composition of the Democratic field remains far from certain.
She had been weighing a bid, and stuck to the April decision deadline she previously set for herself. She is a relative unknown across the state, but in a Democratic field without a heavyweight candidate, she could have been a candidate to watch.
Democratic activist Robert Massie has declared his candidacy and other potential Democratic challengers include Reps. Mike Capuano and Stephen Lynch, Newton Mayor Setti Warren , Alan Khazei, who ran in 2009, Gerry Kavanaugh, a former aide to the late-Sen. Ted Kennedy (D-Mass.). and businessman Robert Pozen. Gov. Deval Patrick (D) and Vicki Kennedy have both said they will not run.
Elizabeth Warren, who serves as special adviser to the Treasury Secretary on the Consumer Financial Protection Bureau, is another name that comes up in Democratic circles. Warren has not given public indication that she has any interest in the race.