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Stop-and-frisk in the NYC race for mayor

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Four of the Democratic candidates for mayor of New York City, Bill de Blasio, the city's public advocate, Sal Albanese, a former city councilman, Bill Thompson, the former New York Comptroller and the Democratic nominee for mayor in 2009, and John Liu, the current city comptroller, debate stop-and-frisk, one of the most hotly police tactics in the country.