NEW YORK – Bill de Blasio was overwhelmingly elected mayor of New York on Tuesday night, according to multiple networks, becoming the first Democrat in 20 years to lead the nation’s largest city and promising to usher in a new era of activist liberal governance.

After polls closed at 9 p.m. in overwhelmingly Democratic New York, de Blasio was projected to soundly defeat Republican Joe Lhota, a protégé of former mayor Rudy Giuliani.

De Blasio, 52, is the city’s elected public advocate and a former member of the City Council. He campaigned on a promise of progressive change. After 12 years under Mayor Michael Bloomberg (I) and eight years of Giuliani before that, de Blasio’s message about income inequality resonated with voters across New York.

Through much of the primary campaign, de Blasio was considered an underdog. But he came from behind to win the Democratic nomination and faced little serious competition from Lhota in the general election.

For more on de Blasio’s campaign and the challenges he will face in City Hall, click here.