Lisa Poole for The Boston Globe

Democratic candidates Mara Dolan, Joe Kearns Goodwin, Mike Barrett, Alex Buck and Joe Mullin participated in a League of Women Voters event August 15.

Former state Senator Michael Barrett of Lexington, Democrat.

Mara Dolan of Concord, Democrat.

Alex Buck of Chelmsford, Democrat.

Greg Howes of Concord, Republican.

Joe Mullin of Weston, Democrat.

Joe Kearns Goodwin, Democrat.

Sandra Martinez of Chelmsford, Republican.