In this issue: COMMENT "The Ungreat Debate", by Hendrik Hertzberg: The first presidential face-off. THE TALK OF THE TOWN "Doppelgangers", by Andrew Marantz: Impersonating the candidates. "Trial and Error", by Mark Singer: Errol Morris, Joe McGinniss, and Sarah Palin. ANNALS OF AUTHORSHIP "Lives of the Saints", by Ariel Levy: The religious right’s leading ghostwriter. A REPORTER AT LARGE "The Hit Man’s Table", by Nadya Labi: How an honors student became a hired killer. THE CURRENT CINEMA "Film Within a Film", by Anthony Lane: Reviews of Argo and Sinister.