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 FIFTH REPORTER FLEES POLITICO IN SINGLE WEEK!Fishbowl DC says congressional reporter Lisa Lerer is going to Bloomberg, which also hired away her colleague Patrick O'Conner. Michael Calderone is off to the new Yahoo blog (Gawker guy John Cook too!), Pia Catton goes to theWall Street Journal, Victoria McGrane to the Dow Jones wire service, and Mike Allen just cold flew straight into the sky, carrying Dick Cheney in one of those recalled baby slings.UPDATE: An email from an insider -- subject line: "Politico bloodletting" -- just told us, "It's far from over. Prepare to yuck it up in the coming weeks." [Fishbowl DC ]