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Ben Carson defends comments on Oregon mass shooting, gun control

One of the leading Republican candidates, Dr. Ben Carson, is facing controversy over comments he made about the Oregon school shooting. A new Quinnipiac poll shows Carson is second to Donald Trump in Ohio, Pennsylvania and Florida. Carson joins "CBS This Morning" to discuss his new book called, “A More Perfect Union: What We the People Can Do to Reclaim Our Constitutional Liberties.”
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