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Herb's 3 Worst CEOs of 2012

Tuesday, 18 Dec 2012 | 4:46 PM ET

CNBC's Herb Greenberg breaks down the bottom 3 on his "Worst CEOs of 2012" list, which includes Microsoft's Steve Ballmer, JC Penney's Ron Johnson and Groupon's Andrew Mason. Ken Langone, Invemed Associates, challenges Herb's methodology.