Why Ted Cruz, Ben Carson, are bulk-buying copies of their own books

Texas Sen. Ted Cruz's newest book, "A Time for Truth," is a bestseller. So is his 2016 rival Ben Carson's "America the Beautiful." Same with Sarah Palin's "Going Rogue," Mitt Romney's "No Apologies," and President Obama's "Dreams From My Father." But in each case, the bestselling book's No. 1 buyer was the politician himself or herself, or a super PAC or group associated with him or her.
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