"Santorum’s assertion [on the primacy of social issues], quite frankly, reflects a certain constitutionally illiteracy and is at odds at a fundamental level with modern conservatism. Indeed, since the presidency requires that the chief executive “preserve, protect and defend the Constitution of the United States” — which presupposes one understands what’s in it — Santorum has in the most concise way possible demonstrated his lack of qualifications to serve," – Jennifer Rubin.