After a crowded primary, Cherelle Parker, a former state representative and City Council member who campaigned on hiring more police, won the Democratic nomination for Philadelphia mayor on Tuesday night, emerging decisively from a field of contenders who had vied to be seen as the rescuer of a struggling and disheartened city. If she wins in November, which is all but assured in a city where Democrats outnumber Republicans more than seven to one, Ms. Parker will become the city’s 100th mayor, and the first woman to hold the job. Of the five mayoral hopefuls who led the polls in the final stretch, Ms. Parker, 50, was the only Black candidate, in a city that is over 40 percent Black. She drew support from prominent Democratic politicians and trade unions, and throughout the majority Black neighborhoods of north and west Philadelphia. But she said that many of her proposed solutions had roots in Philadelphia’s “middle neighborhoods” — working and middle-class areas that have been struggling in recent years to hold off decline.

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