Pedro Espada Jr. will hold the title of Senate majority leader. (Photo: Rob Bennett for The New York Times) Even as some State Senate Democrats privately questioned a power-sharing deal struck by their leader, Malcolm A. Smith, the three former dissidents who brokered the deal are making clear that they expect him to stand by it. Under the deal, when Pedro Espada Jr., a former state senator and city councilman, returns to the Senate in January, he will hold the title of Democratic majority leader and Mr. Smith will be named president pro tempore. The two positions have traditionally been...