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Martha Coakley has agreed to limit her campaign spending so she can participate in the state's public campaign financing program.
Coakley, who is seeking the Democratic nomination for governor, joins fellow Democratic candidates Joseph Avellone and Donald Berwick and Republican candidate for governor Mark Fisher.
Coakley and the other candidates must agree to limit expenditures to $1.5 million for the primary and $1.5 million for the general election.
State elections officials estimate there will be $1.25 million in the campaign fund to be divided evenly between the primary and general election campaigns.
Democratic candidates Steven Grossman and Juliette Kayyem, and Republican Charles Baker, will not participate.
The sole source of funding for public financing is the State Election Campaign Fund, which allows taxpayers to direct $1 from their tax liability to the fund.