FILE - In this Sept. 4, 2014, file photo, New York Mayor Bill de Blasio and his wife, Chirlane McCray, center, visit a pre-kindergarten class on at the Sacred Heart School in the Staten Island borough of New York on the first day for the city's public schools and the first day of the mayor's expansion of early childhood education. Free school for 4-year-olds was de Blasio's signature issue during his successful run for mayor in 2013. Facing re-election he has announced an ambitious plan to expand the effort to 3-year-olds. (Susan Watts/The Daily News via AP, Pool, File)
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