The survey was conducted by Greenberg Quinlan Rosner Research for state Sen. Karen Spilka, who takes second in the poll with 14 percent support, according to Boston Magazine.

State Sen. Katherine Clark, widely believed to be the early frontrunner, is slightly ahead, with 15 percent support.

Middlesex County Sheriff Peter Koutoujian has 12 percent, state Sen. Will Brownsberger takes 11 percent and state Rep. Carl Sciortino has 4 percent support.

But 43 percent of respondents are still undecided, indicating the candidates all have an opportunity to expand their share of the vote in time for the Oct. 15 primary, which is likely to choose the ultimate winner in this heavily Democratic district.