A small coterie of aging Harlem powerbrokers gathered in a secret hideaway this week and cut a deal that will send reverberations throughout New York City. According to sources, Sen. Charles Schumer has agreed to vacate his office prior to the next election to run for governor in 2006. Though Schumer has consistently denied having any gubernatorial ambitions, the source says he is stepping down because "he is miserable being senator and hates playing second fiddle to Hillary Clinton." Schumer has agreed to pick former State Comptroller Carl McCall to fill his vacancy. McCall was defeated by Gov. Pataki in...