Harvard law professor Alan Dershowitz debated an empty chair last night. Two hundred students turned out to hear the debate-which-was-not-one, Dershowitz's way of showing his contempt for those who signed Harvard's divestment petition. The particular target of Dershowitz's ire was Winthrop House Master and Near Eastern Languages professor Paul Hanson, who signed the petition along with 73 other Harvard faculty members. Outraged by an act he vociferously condemns as both "anti-Semitic" and "ignorant," Dershowitz challenged Hanson to a debate. When Hanson declined, Dershowitz went ahead with an empty chair for his opponent. The debate was held in Winthrop House. Taped to the empty chair was a copy of Harvard's divestment petition. ìYour House master is a bigot and you ought to know that,î Dershowitiz told the audience. ìEveryone else who signed that petition is also a bigot.î