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Ahead on the 12/17 Maddow show

Tonight's guests include:Cory Booker, mayor of Newark, NJ, and member of Mayors Against Illegal GunsRep.

Tonight's guests include:

Cory Booker, mayor of Newark, NJ, and member of Mayors Against Illegal Guns

Rep. Chris Murphy, (D) Connecticut who represents Newtown, and Senator Elect of Connecticut

Chief John Edwards, chief of police at Oak Creek, WI, where the shooting at the Sikh Temple of Wisconsin this past August took place

Executive producer Bill Wolff shares a preview of tonight's show: