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Ahead on the 12/19 Maddow show

Tonight's guests include:Sen.

Tonight's guests include:

Sen. Barbara Boxer, (D) California, chairman of the Senate Environment and Public Works committee and senior member of the Senate Committee on Foreign Relations

Andrea Mitchell, NBC News chief foreign affairs correspondent and host of “Andrea Mitchell Reports” on msnbc

Here's tonight's song. 

And here's executive producer Bill Wolff with a look at tonight's show: