Much to the chagrin of candidates like Mr. Gioia, the still relatively little-known 10-year-old party [Working Families Party] had dispatched a small army in the weeks before the primary, selling voters on its candidates in the mayoral, City Council, public advocate and comptroller races. Organizers knocked on 227,928 doors and talked to 62,112 voters, a party official said. On Tuesday, more than 350 workers were stationed throughout the city, most working for a day rate of $100. Their efforts resulted in the party’s best electoral showing yet. In the public advocate’s race, the Working Families endorsed Bill de Blasio, a...