Image Credit: Jeff Chiu/AP ImagesO, what a trip it’s been. Less than a month after politicos and journalists got themselves all frothed up over an Amazon.com posting for the anonymously written O: A Presidential Novel, the author has been unmasked. Mark Halperin of Time has confirmed that John McCain aide and speechwriter Mark Salter is the pen behind the work of speculative semi-fiction. Well, that was certainly quicker than with Primary Colors: Scribe Joe Klein managed to elude identification for about seven months back in 1996 when that anonymous political novel was published. Salter and Simon & Schuster head Jonathan Karp have yet to confirm this revelation.