"What's next? I'll keep you posted on my plans," Weiner wrote. "But I hope we keep the band together."
"Our team has to be a font of ideas and debate," he added, recounting how his supporters pushed debate on national health care and showed "compassion" for the needy. "I tried to run my campaign on this theme and the response was amazing. (Who knows, maybe I have a third book of ideas in me!)"
Weiner also issued an apology of sorts for the events of 2013. His mayoral campaign floundered this summer after he apologized for sending sexually explicit photos and messages online, echoing his resignation from Congress in 2011 over lewd photos.
"It certainly didn't go as I had hoped," Weiner wrote. "I continue to be deeply sorry that my personal mistakes undermined an amazing campaign that included too many amazing staffers to mention and hundreds of volunteers and many of you who kept active from afar with ideas, contributions and encouraging notes."