Democrats are stirring in their quest to unseat Sen. Scott Brown (R-Mass.) in 2012.

Newton Mayor Setti Warren issued a statement this week saying he is actively considering a run.

“I have been disappointed by many of his votes, which I believe have hurt many cities and towns in Massachusetts, including my own community of Newton,” Warren said. “I’m not yet ready to announce an official decision on entering the race. But in the final analysis, if I believe I can do a better job for Massachusetts, I’ll put my name on the ballot.”

Warren, an Iraq War veteran, is Newton’s first black mayor and a former aide to Sen. John Kerry (D-Mass).

Gov. Deval Patrick has repeatedly dropped Warren’s name as a potential candidate, in addition to Salem Mayor Kim Driscoll, nonprofit leader Alan Khazei and former lieutenant governor candidate Bob Massie, who has already declared his candidacy. Others to watch include Democratic Reps. Mike Capuano and Stephen Lynch.