By Noah Goldberg From New York Daily News Federal prosecutors trying the accused leader of a sex cult at Sarah Lawrence College have “modeled” part of their case on the successful conviction of R&B star and sex trafficker R. Kelly. The feds allege Lawrence Ray, 62, forced his one of his victims into sex work and compared the case to the “Sex Me” singer’s after defense attorneys for Ray argued that testimony about coerced sex with strangers should be prohibited. “The defense implies that the Government’s forced labor theory is unprecedented,” wrote Assistant U.S. Attorney Danielle Sassoon in papers filed in Manhattan Federal Court Friday. “Not so. It is modeled after the forced labor predicates charged in the recent prosecution of Robert Silvester Kelly (”R. Kelly”), who was convicted by a jury on all counts.” Ray is charged with forcing one of his victims to have sex with strangers for …