Democrat Shenna Bellows, of Manchester, announced Friday she is running for state Senate District 14.

Bellows owns a nonprofit consulting business and is interim executive director of LearningWorks in Portland. She is the former executive director of American Civil Liberties Union of Maine and ran unsuccessfully in 2014 against Sen. Susan Collins, R-Maine, for the U.S. Senate.

Bellows is the third Democrat to announce she is running to represent the district, which consists of Chelsea, Farmingdale, Gardiner, Hallowell, Manchester, Monmouth, Pittston, Randolph, Readfield, West Gardiner and Winthrop. In recent weeks, Gardiner resident Terry Berry, a local real estate agent and city councilor, and Winthrop resident George O’Keefe Jr., an intelligence analyst in the Maine Army National Guard, announced they are running for the seat.

Sen. Earle McCormick, R-West Gardiner, announced earlier this week that he is not seeking re-election. Republican Maureen Blanchard, a Gardiner City Council member, is running to take his place.