Suffolk DA Daniel F. Conley joins race to succeed Thomas M. Menino as mayor of Boston

Suffolk District Attorney Daniel F. Conley today formally declared he will run for mayor of Boston.

Conley, a former city councilor from Hyde Park who now lives in West Roxbury, issued a statement announcing his candidacy this afternoon.

“Boston is a great city, and with the right leadership and vision, its best days are still ahead. So today I am officially declaring that I am a candidate for Mayor of Boston,’’ Conley said.

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With some $800,000 in the bank, Conley immediately becomes the best financed candidate in a political lineup whose membership is changing daily. State Sen. Sonia Chang-Diaz, who was talked about as a strong contender on Tuesday, today took herself out of the running.

Conley has been the chief prosecutor for Boston, Chelsea, Revere and Winthrop since 2002, a post he first obtained through gubernatorial appointment but has since won election to keep his current job.

In his statement, Conley defined himself and his political career as the person who sought to empower the “voiceless.’’

“My entire career has been dedicated to giving voice to the voiceless and hope to the most poor and vulnerable among us. Boston needs to be a city where long-time residents and those fixed on incomes can feel secure, and where middle class families aren’t priced out,’’ he said in the statement. “It means making Boston a place where younger residents can start careers and families, and where our poorest neighbors can find real economic hope and mobility.’’

Conley said he wants to make city government responsible and accountable and to combat “old divisions and superficial differences.’’

“To make Boston the city we want it to be requires a mayor who can make tough decisions, even when they offend powerful interests and upset the status quo. It’s going to require a mayor who leads with integrity, for whom transparency is a way of doing business and not just a buzzword, and who will ensure that city government is responsive and accountable to the people it serves,’’ he said.

He said he has the ability to unite the city.

“These qualities are the hallmarks of my career and the leadership I will bring to the Mayor’s office,’’ he said. “So if you are like me and love this city and want to see it live up to its full promise and potential, then my campaign is your campaign.’’

He added, “Boston can only reach its full promise and potential when every one of its residents has a fair chance to reach theirs. I intend to put my heart and soul (and several pairs of shoes) into this campaign. I ask for your support, your energy, and your ideas and together we’ll make Boston the most livable and workable city in America.’’