Rick Santorum is touting his promise to eliminate corporate taxes on manufacturers...[that's] coming under scrutiny from conservatives who are decrying it as thoroughly unconservative. ...[Santorum] added: “We need to have a manufacturing base in this economy. Why? Because of our national security.” ...advocates for other sectors of the economy quietly gripe that they’d be effectively underwriting manufacturing...by paying a higher tax rate... “Giving a preferential rate is picking winners and losers through the tax code,” said Curtis Dubay, a tax policy analyst at the Heritage Foundation... “This is not free-market economics, this is trying to tilt the market toward manufacturing,...