(NYTIMES) — Anthony D. Weiner’s improbable campaign for mayor was engulfed on Tuesday by a new scandal involving explicit online messages, imperiling his political resurrection two years after he resigned from Congress over similar behavior.

Mr. Weiner, appearing solemn and a bit worn as he faced more than 100 journalists amid the cubicles in a vacant Chelsea office, acknowledged that his habit of sending sexual images and texts to female fans had continued for more than a year after he left Congress vowing to seek treatment and change his behavior.

“It’s in our rearview mirror, but it’s not far,” he said.

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