"We are going to keep laying out her forward-looking ideas for New York's middle class and making the case that she is the only candidate in the race with an actual record of getting things done, " Mr. Morey said.

WSJ: Website, Video Says Anthony Weiner to Run for New York City Mayor

Mike Morey, a spokesman for Ms. Quinn, said the Quinn campaign also doesn't plan to readjust its strategy in response to Mr. Weiner's entrance.

WSJ: Website, Video Says Anthony Weiner to Run for New York City Mayor

"When he's finished explaining those ethical lapses, perhaps he can then explain what he knew about his former Giuliani administration buddy Bernie Kerik, " said the Quinn campaign spokesman, Mike Morey, referring to the former police commissioner serving a federal prison sentence after pleading guilty to corruption charges.

WSJ: Lhota, Quinn Trade Swipes on Ethics