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Mayor Michael Bloomberg usually says he won't take questions about the crowded race to replace him. But after a forum of 2013 mayor candidates in Brooklyn on Thursday, the mayor couldn't help himself.

"Number one: They have no idea what they are talking about," Bloomberg said on his radio show Friday. "Number two: they have no suggestions of what to do. And number three: they just sound ridiculous."

On Thursday night, several potential successors were sounding off on Mayor Bloomberg.

"In neighborhoods across the city of New York, from day one, were looking for assistance from the city of New York, and it wasn't there," said former Comptroller William Thompson. "This still is a city administration that wanted to run a marathon."

"It's quite possible that Mayor Bloomberg doesn't know what mold is," said City Comptroller John Liu.

That's not the assessment the mayor said his administration deserves.

"You have to say thank you, and you have to understand these problems aren't simple," he said.

There was one caveat in the mayor's criticism.

"I will say, you know, the one aspirant that we know of on the Democratic side that really hasn't engaged in most of this foolishness is Quinn," Bloomberg said. "She's much more rational and understands there's no simple solution to complex problems."

The field to replace Bloomberg is quickly taking shape. In fact, Public Advocate Bill de Blasio is expected to officially declare his candidacy for mayor on Sunday during an event at his house in Brooklyn. He'll join Thompson, Tom Allon and Joseph Lhota, who have all officially declared their run for mayor.

When NY1 touched base with the speaker's campaign, they had no official comment on de Blasio's announcement or the mayor's take on the 2013 field. As of this point, it's unclear when there will be an official campaign announcement from the speaker herself.