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NEW YORK — Bill de Blasio has gone from afterthought to front-runner with stunning speed.

The most liberal candidate in the New York City mayoral race, whose City Hall bid was foundering mere weeks ago, now enjoys a shocking perch atop the polls in the latest turn of the most unpredictable citywide campaign in decades.

And with the Democratic primary less than a month away, de Blasio may have hit his stride at just the right time.

De Blasio, the city’s public advocate, has been given a second look by an electorate that appears intrigued by his progressive policies and charmed by his multiracial family. His first TV ad, narrated by his soft-spoken son, Dante, 15, came out just before his rise in the polls.

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De Blasio, of Brooklyn, has also clearly benefited by the implosion of Anthony Weiner’s candidacy, winning over legions of supporters turned off by the former Brooklyn and Queens congressman’s latest sexting scandal.

“When Weiner entered the race, de Blasio was the most hurt, since they were both outer borough candidates appealing to the same progressive voters,” said Jeanne Zaino, a New York University political-science professor. “Those people have now turned to him.”

Independent Mayor Michael Bloomberg’s impending departure after 12 years in office has created a wide-open race; the Democratic field has had three different leaders in as many weeks.

A Quinnipiac University poll this past week showed that de Blasio’s support had doubled in less than a month, pushing him from fourth to slightly ahead of the pack. A second poll showed him in a dead heat with City Council Speaker Christine Quinn, with ex-comptroller Bill Thompson slightly behind. Weiner, once the leader, is now fourth.

De Blasio, 52, believes it was a matter of time before his message resonated with left-leaning voters in New York City, where Democrats outnumber Republicans 6 to 1.

“It’s happening now because people are finally starting to focus on the race,” de Blasio said. “After 12 years of Mayor Bloomberg, people want a real change.”

De Blasio, though largely unfamiliar on the national stage, has been a fixture for two decades in New York politics.

He was born in Massachusetts — and remains a Boston Red Sox fan — but as an adult became entrenched in the New York’s liberal circles. De Blasio, who stands 6-feet-5, advised former New York Mayor David Dinkins, worked in Bill Clinton’s White House, chaired Hillary Rodham Clinton’s 2000 Senate campaign and served on the City Council before becoming public advocate four years ago.

It is rare to find a candidate who appears almost gleeful when proposing raising taxes, but de Blasio has happily made as the centerpiece of his campaign a proposal to raise taxes on the wealthy to pay for universal prekindergarten.

He repeatedly brandishes the phrase “A tale of two cities” to rip the economic inequality between the rich and poor in the nation’s largest city. He often bashes Quinn’s links to Bloomberg and calls for more affordable housing.

He also has consistently attacked the New York Police Department’s stop-and-frisk program — stopping and searching people deemed to be acting suspiciously — as discriminatory to blacks and Hispanics, an effort handed a victory last week when a judge appointed a federal monitor to oversee the department.

De Blasio has aggressively courted minority voters, who are expected to make up more than 50 percent of the electorate on primary day, Sept. 10. He has won endorsements from several black and Latino elected officials and the city’s largest labor union, composed largely of minority workers.

He also has put his interracial family at the heart of his campaign.

His wife, Chirlane McCray, is an African-American who identified as a lesbian until meeting him, and their two children, Dante and Chiara, 18, are frequently on the campaign trail.

Dante lovingly talks in the ad about his father’s life and policies, including his opposition to stop-and-frisk. His earnest delivery and impressive Afro have made him a Twitter star, leading to the lighthearted hashtag #fromentum.

“It’s very effective and uses his family well,” said Zaino, who noted that many New Yorkers have “Bloomberg fatigue” and such an ad is unlike anything the mayor would have done.

One of de Blasio’s challenges — one harped upon by rivals — is to explain what, exactly, his job as public advocate entails. The position was created in 1993 to be the city’s watchdog, but it has little real power.

One recent crisis, though, allowed de Blasio to show what his office can do. He fought the state university system’s plan to close a Brooklyn hospital, staging a series of protests and getting arrested at one. He secured a restraining order to keep the hospital open.

“He’s peaking at the right time,” said Jamie Chandler, political-science professor at Hunter College. “But the race is still close — anything can happen.”

Associated Press writer Bethan McKernan contributed to this report.

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