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As we pointed out earlier this week, things have taken a turn for the worse at Condé Nast's glossy (and very expensive) business magazine, Portfolio. Another sign today that the ship may be sinking: deputy editor Blaise Zerega, who has been with the magazine since its launch in 2006 and was widely viewed as one of the brightest talents at the mag (in contrast to mediocre editor-in-chief Joanne Lipman), has announced he's leaving the company for, an new online-video site. [Valleywag, previously]