A stakeholder can be any person, community, company, or group who is impacted (both negatively or positively) by an issue and how it is handled. This link provides some good ideas on how to identify stakeholders.
You can also search newspapers (such as the Hartford Courant, the Connecticut Mirror, and the New York Times) for coverage of the topic, which should mention people and organizations involved in an issue. The New Haven Register and other local Connecticut newspapers are vailable in the Newsbank databases.
Try using Google to look for local organizations: "Connecticut and obesity".
The Connecticut General Assembly webpage contains texts of bills, actions taken, and (at the lower right of each bills main page) transcripts of public testimony by stakeholders.