Democratic New York mayoral nominee Bill de Blasio, left, laughs with Christine Quinn, city council speaker and former mayoral hopeful, at a news conference Sept. 17. (Mario Tama/Getty Images) Democratic New York mayoral nominee Bill de Blasio, left, laughs with Christine Quinn, city council speaker and former mayoral hopeful, at a news conference Sept. 17. (Mario Tama/Getty Images)

Bill de Blasio's campaign for New York mayor announced the endorsement of President Obama on Monday.

Obama joins Bill and Hillary Clinton, who endorsed de Blasio last week after de Blasio's potential Democratic runoff opponent, 2009 nominee Bill Thompson, conceded.

“Progressive change is the centerpiece of Bill de Blasio's vision for New York City, and it's why he will be a great mayor of America's largest city," Obama said in a statement provided by de Blasio's campaign. "Whether it’s ensuring pre-kindergarten is available for every four-year old, expanding after-school programs for every middle school student who wants and needs them, making affordable housing available for more New York families and preserving community hospitals, Bill's agenda for New York is marked by bold, courageous ideas that address the great challenges of our time."

De Blasio is a heavy favorite against GOP nominee and former Metropolitan Transportation Authority chairman Joe Lhota. A poll last week showed de Blasio leading Lhota 66-25.