Hefling, Kimberly (July 21, 2006). "Santorum claims Iran at heart of world's conflict". Kimberly Hefling (September 26, 2006). "Casey Doubles Lead Over Santorum". Miller, Jeff (January 26, 2006). "Santorum denies doing work with K Street undertaking". Marcus Stern and Kristina Cooke (January 5, 2012). "Rivals set to pounce on Santorum's previous". McIntire, Mike Luo, Michael (January 6, 2012).