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National Review’s Washington editor Robert Costa appeared on CNBC’s The Kudlow Report on Tuesday night to discuss Scott Walker and the possibility of a 2016 presidential run. This week, Costa broke the story about the Wisconsin governor’s plans to write a book about his time in office. Walker has tapped Marc Thiessen, a former chief speechwriter for President George W. Bush, to co-write the book, which will be titled Unintimidated and published later this year.