Presidential hopeful Herman Cain isn't just a former CEO of Godfather’s Pizza and head of the National Restaurant Association. He was also once a prolific writer, who up until January 2011 produced a weekly opinion column published by the conservative website WorldNetDaily. In at least one column, Cain seemed to condemn a proposal that is now a pillar of his highly touted 9-9-9 tax plan. On November 12, 2010, Cain wrote a column about rumors that Democrats would propose a consumption tax called a VAT. "The worst idea is a proposed national sales tax," Cain wrote. A 9% national sales...