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Happy Pi Day!

Bill Wolff, executive producer for the Rachel Maddow Show, shares a preview of tonight’s show – we’re taking a look at election delegate strategies for this year’s campaign, plus Sen. Barbara Boxer is our guest tonight to discuss the highway bill that passed the Senate but faces loads of obstructions in the House, and how candidate Newt Gingrich’s presidential campaign reflects the story of one of our favorite movie characters.