Bill de Blasio will be the 109th mayor of New York City, the first Democrat in 20 years to hold the office. The city's public advocate will follow the 12-year tenure of Michael Bloomberg after voters rejected the Republican candidate Joe Lhota, who promised to carry on with a Bloomberg-style approach to the city. The call in de Blasio's favor was made by various outlets immediately after the polls closed at 9 p.m. in the city, based on exit polls. So quickly, it seems, that the mayor-elect's victory party wasn't even quite set up at the time of the first call. By 9:45 p.m., Lhota had conceded

Although de Blasio's exact margin of victory won't be known for awhile, the New York Times noted that his exit poll victory was by a "wide margin:" 

Exit polls conducted by Edison Research suggested that the sweep of his victory cut across all of New York’s traditional divides. He won support from voters regardless of race, gender, age, education, religion or income, according to the exit poll.

Before Bloomberg was in office, Rudy Giuliani had the job. Giuliani campaigned for Lhota during the primaries. For some, today's vote was a reaction to the terms and styles of both previous mayors. De Blasio ran on a progressive platform, borrowing the "tale of two cities" to describe a Bloomberg-friendly class of wealthy New Yorkers, and a marginalized class of working class and low income residents of the city. He's also an outspoken opponent of the city's "stop and frisk" policing policy. 

Despite the decisive margin, whatever that final tally shows, de Blasio's victory was just months ago something of a longshot. Talking Points Memo has a good reminder of that: 

For more than two years, de Blasio polled behind a rotating cast of Democratic frontrunners, including City Council Speaker Christine Quinn and former Rep. Anthony Weiner. After the latter's spectacular, scandalous implosion, de Blasio began to surge in mid-August with the help of a wildly successful television ad campaign. He never looked back.

We'll add more as reactions and numbers come in.