"In this Oct. 21, 2015 file photo, New York City Mayor Bill de Blasio speaks during a media briefing in New York. De Blasio, a Democrat, announced during a Friday, Oct. 30, 2015 appearance on MSNBC's ""Morning Joe"" that he's backing Hillary Rodham Clinton for president. He called her the best candidate to address income inequality.(AP Photo/Seth Wenig)"
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