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Input: A sexting compulsion that cost Anthony Weiner  his  seat in Congress and a chance to be New York City's mayor is about to cost  him   his  freedom too.
 Weiner   a Democrat  is scheduled to surrender by 2 p.m. Monday at Devens Federal Medical Center in Massachusetts to serve a 21-month sentence for illicit online contact with a 15-year-old girl.
 Weiner  was sentenced in September by a judge who said  Weiner 's crime resulted from a "very strong compulsion."  A tearful Weiner  said  he  was undergoing therapy and had been "a very sick man for a very long time."
Amid a sexting controversy involving women   Weiner  resigned  his  House seat in 2011 only to have new allegations doom his 2013 run for mayor.
Last year  a criminal probe into his sexting with a high school student intruded into Democrat Hillary Clinton's bid for the White House. Then-FBI Director James Comey announced in late October 2016 that he was reopening the probe of Clinton's use of a private computer server after emails between Clinton and Weiner's wife  Huma Abedin â formerly Clinton's closest aide â were found on  Weiner 's laptop computer.
Abedin and  Weiner  are in divorce proceedings.
At sentencing in Manhattan federal court   Weiner  attorney Arlo Devlin-Brown said his client likely exchanged thousands of messages with hundreds of women over the years and was communicating with up to 19 women when he encountered the teenager.

Anthony Weiner set for prison stint for sexting conviction