Bronx Borough President Fernando Ferrer says if he is elected, he will put a stop to Bruce Ratner's Brooklyn mini-city plan which includes the Nets' new arena. But one of Ferrer's supporters, the Rev. Al Sharpton, quickly rebuked him for "playing politics" with a project that could bring housing and jobs to the city's minorities. Meanwhile, Ratner faces a new controversy. It appears low-income housing he has promised will not be built as part of the project, but in a lesser Brooklyn neighborhood.