For weeks, state Senator Susan Fargo stood by as several members of the state’s congressional delegation endorsed candidates in the race to replace her in the Third Middlesex District. But then Fargo decided she also has something to say. Fargo, who is not seeking reelection, on Thursday endorsed Concord Democrat Joe Kearns Goodwin in the highly contested primary race. The other Democrats in the Sept. 6 primary are Mike Barrett of Lexington, Alex Buck of Chelmsford, Mara Dolan of Concord, and Joe Mullin of Weston. On the Republican side, Greg Howes of Concord and Sandi Martinez of Chelmsford are seeking their party’s nomination.
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