From the NY Times:
Mr. Weiner said that despite backing away from plans to run for mayor this year, he remains the target of a well-orchestrated smear campaign that can be traced to the re-election bid of Mayor Michael R. Bloomberg.
Jill Hazelbaker, a spokeswoman for the Bloomberg campaign, would not address Mr. Weiner’s claim that the campaign was behind the negative press.
Mr. Weiner said he was speaking out about the issue because of what he views as hypocrisy: Mr. Bloomberg is publicly pledging a “positive campaign,” while his campaign is generating many of the stories, which have appeared in the city’s three major daily newspapers as well as on local television news programs.
Well of course that's what's going on. If you can't take the heat, however, maybe you should stop hinting at running already.