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Ahead on the 12/14 Maddow show

On tonight's show we'll be continuing msnbc's live coverage of the school shooting in Connecticut. Our guests include: Dave Cullen, author of

On tonight's show we'll be continuing msnbc's live coverage of the school shooting in Connecticut. Our guests include: Dave Cullen, author of “Columbine”; Bob Herbert, distinguished senior fellow at Demos, former New York Times columnist; Rep. Carolyn McCarthy, (D) New York.