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One of his challengers, independent David Grosso, questioned the timing of Mr. Brown’s public-financing bill and said he previously mentioned the New York City program in his own set of ethics proposals.

“My opponent is taking on some of my ideas, so at least I’m having some impact,” Mr. Grosso, of Brookland, said Thursday.

He said Mr. Brown had four years to move his legislation but issued a formal call for the task force less than two months before the election.

“It’s one thing to speak about it, it’s another thing to act on it,” Mr. Grosso said.

Mr. Brown, who could not be reached by phone on Thursday, has argued he is the only one talking about the city issues, such as jobs and housing.