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Following months of tumult over CBS News editor-in-chief Bari Weiss’s hiring of executive producer Nick Bilton and firing of top on-air talent Sharyn Alfonsi, Scott Pelley, and Cecilia Vega (and behind the camera), CBS’s 60 Minutes premieres a new season Sunday on the heels of a NewsBusters analysis that found, over the past six seasons, their political stories have skewed heavily to the left by a five-to-one margin.A NewsBu…