Zac Blanchard holds lead over Eric Costello in tight City Council raceCanvassers poured over almost 5,000 provisional and mail-in ballots Wednesday, more than initially expected. Of those, about 2,000 were thrown out, and about 744 will be only “partially accepted,” or counted in statewide races, due largely to voters filling out ballots in the wrong council district or to unaffiliated voters erroneously participating in the May 14 closed primary, city Board of Elections representatives said Wednesday evening.