In what may have been a slip of the tongue in an interview with New York Magazine, Bloomberg called de Blasio's campaign "class-warfare and racist," only to clarify that he believed de Blasio used his bi-racial family in ads to appeal to black voters.
"I think Bloomberg is very frustrated. He took a real beating during the campaign especially from de Blasio," Arzt said. "And Bloomberg looks down his nose at de Blasio for not having a business background."
If de Blasio's narrow edge of 40 percent hold up, making him the Democratic nominee, he will try to become the first Democrat elected to the nation's largest city since 1989.
He would face the Republican candidate, former Metropolitan Transit Authority chairman and former deputy mayor to Rudy Giuliani, Joe Lhota in November.
To close the deal with the general electorate -- composed of more than 800,000 people who are not affiliated with either the Democratic or Republican Party — he may have to moderate, Moss said.
"He's a professional politician and he will recognize that he will need to move to the middle in order to win a general election," Moss said. "Running the city is going to require you to be constantly attentive to the different interests and different groups of people."