America has changed since Clinton last spoke on issues such as income inequality, said de Blasio.
The mayor's comments were criticized by some Hillary Clinton supporters.
De Blasio is staying out of the fierce race between Rangel and Espaillat but will support the winner.
The move is the latest in the escalating endorsement race between Rangel and Adriano Espaillat.
In a statement, President Obama praised Bill de Blasio's message of "progressive change."
City Council Speaker Christine Quinn, once a front-runner, urged New Yorkers to vote for Bill de Blasio.
Ex-governor Eliot Spitzer got the backing of CSEA, the state's largest union for public sector employees.
Adam "Ad-Rock" Horovitz will speak at an event at Bowery Station Monday night on Squadron's behalf.
Corey Johnson and Yetta Kurland will now face off in the September Democratic primary.
A candidate's support of the NYPD inspector general will not be a deal-breaker for Mayor Bloomberg.
Mayor Michael Bloomberg said he's already made his pick for 2013.
A DNAinfo.com New York report found that Quinn's home club support is waning, but she's not worried.
The Independence Party will vote Wed. night to endorse Adolfo Carrión, Jr. for mayor.
Mayor Michael Bloomberg heaped praise on City Council Speaker Christine Quinn on Tuesday.
Following Hurricane Sandy, Bloomberg has endorsed Obama for re-election.
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