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Ahead on the 12/19 Maddow show

Tonight's guest list and video preview.

Tonight's guests include:

Steve Clemons, senior fellow at the New America Foundation, Washington editor at large for "The Atlantic" and MSNBC contributor

Thomas Cullen, former federal prosecutor in Virginia, now a partner with the law firm of Woods-Rogers

Here's senior producer Cory Gnazzo with what's lined up tonight: