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Candidates for the Massachusetts 5th District Congressional seat in the 2013 special election, left to right: State Sen. Will Brownsberger, D-Belmont, State Sen. Katherine Clark, D-Melrose, Middlesex County Sheriff Peter Koutoujian, of Waltham, State Rep. Carl Sciortino, D-Medford, and State Sen. Karen Spilka, D-Ashland.

State Sen. Katherine Clark is leading the field in the 5th District congressional race, according to a new poll released Friday by the Emerson College Polling Society.

In the Democratic primary, which will be held this Tuesday, the poll found Clark ahead with 29 percent, followed by State Sen. William Brownsberger (19 percent), State Rep. Carl Sciortino (16 percent), State Sen. Karen Spilka (15 percent), and Middlesex County Sheriff Peter Koutoujian (14 percent).

However, when asked who they thought would win the primary, 27 percent said Clark, 17 percent chose Koutoujian and 14 percent named Spilka.

The poll found Clark, Brownsberger and Spilka all getting a significant amount of support in their geographic home bases. Clark is from Melrose, Brownsberger from Belmont and Spilka from Ashland.

The polling society is a student-run organization at Emerson College. There has been almost no public polling of the 5th District race, and only a handful of internal polls conducted by the candidates.

The Boston Globe endorsed Clark on Friday.

The poll of 471 likely Democratic primary voters was conducted Oct. 2-8 and has a margin of error of plus or minus 4.5 percent.