Other possible Democratic candidates include Charlie King , the head of a nonprofit organization that provides housing to homeless people and an unsuccessful candidate for lieutenant governor two years ago ; Assemblyman Richard L. Brodsky of Westchester County ; Assemblyman Michael N. Gianaris of Queens , who is leading the pack in fund-raising with more than $ 1.6 million ; Sean P. Maloney , a lawyer who worked as an aide to President Bill Clinton ; and Denise O'Donnell , the United States attorney for the Western District of New York .