Former Rep. Anthony Weiner (D-N.Y.) on Sunday unveiled his first television ad in his bid to be New York City mayor, vowing to fight the “powerful voices” he says are trying to force him from the race.

“Look, powerful voices have made it clear from the very beginning that they didn’t want me to win,” Weiner says in the 30-second clip, speaking to the camera. “But this isn’t about what they want. They've gotten their way for far too long.

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“If you give me the chance, I will fight for you and your family every single day,” Weiner says.

Weiner has plummeted in the polls since admitting last month that he continued to send sexually explicit messages to young women on the Internet long after similar behavior forced him to resign his House seat.

Weiner has faced a wave of criticism from prominent Democrats, urging him to step down from the race.

In the ad, Weiner said he would continue talking about the issues important to New York voters.

“I’ve waged a campaign focused like a laser beam on fighting for the middle class and those struggling to make it,” Weiner said.

The candidate shared the ad late Sunday with supporters in a campaign email, according to reports, and has spent $500,000 on the ad buy.

A New York Times/Siena College poll released on Thursday found Weiner in fourth place in the New York City mayoral race with 10 percent support from Democratic primary voters, well behind front-runner City Council Speaker Christine Quinn at 26 percent.