FILE - In this April 3, 2012 file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum greets supporters in Cranberry, Pa. Republican presidential candidate Rick Santorum's plan to use state conventions to pull support from Mitt Romney has stalled in North Dakota, where Romney has the largest group of backers among the state's national convention delegates. (AP Photo/Jae C. Hong, File)
Read the article: Santorum Delegate Plan Hits Wall in North Dakota
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