BOSTON (AP) — Two-term state Sen. Dan Wolf, a businessman who helped create Cape Air, has become the third Democrat to officially enter the 2014 race for governor.

The Harwich resident announced his candidacy on Wednesday in a statement and a video posted on his campaign website.

"For the working people of Massachusetts, and our children, the future is uncertain. Despite progress, we still have an economy that is not working for many of us," Wolf said in the video. "We need an economy not guided by special interests whose short-term goals are holding us back from fulfilling our promise."

Donald Berwick, a pediatrician from Newton and former top health care official in President Barack Obama's administration, and Joseph Avellone, a life sciences company executive and former Wellesley selectmen, previously announced their candidacies for the Democratic nomination for governor.

The Democratic State Committee, in a separate announcement, said Wednesday that Wolf, Berwick and Avellone would address the 2013 Democratic platform convention in Lowell on Saturday. The event will signal a jumping off point of sorts for the gubernatorial race.

State Treasurer Steven Grossman plans to announce at the convention that he will be running for governor, a political aide said. Attorney General Martha Coakley, U.S. Reps. Michael Capuano and Stephen Lynch and Somerville Mayor Joseph Curtatone also are considering entering the race. Incumbent Democratic Gov. Deval Patrick has ruled out a third term.

On the Republican side, the list of potential candidates includes 2010 Republican gubernatorial nominee and former Harvard Pilgrim Health Care CEO Charles Baker and former U.S. Sen. Scott Brown.

In his announcement, Wolf, 55, touted his experience as one of the founders of Cape Air, saying the employee-owned regional airline started with one plane 25 years ago and now flies more than three dozen routes and has more than 1,000 employees. Wolf, whose background was as a pilot and mechanic, said he still flies a regular route.

"As a businessman and an entrepreneur I know that government cannot solve all our problems," Wolf said. "But it can and should help define a vision for our future, a vision of economic and social justice, and then make investments to ensure that every kid has a chance to reach his or her full potential."

Wolf was first elected to the state Senate in 2010 and re-elected in November, representing the Cape and islands.