Rick Santorum greets supporters Tuesday during a primary night rally in Mars, Pa. Photo by Paul J. Richards/AFP/Getty Images. Former Pennsylvania Sen. Rick Santorum sounded defiant as ever in his speech Tuesday night, but after a sweep by Mitt Romney…

Mitt Romney greets supporters Sunday during a pancake brunch in Milwaukee. Photo by Justin Sullivan/Getty Images. As former Massachusetts Gov. Mitt Romney has picked up momentum and endorsements over the last few weeks, his armor of inevitability has grown…

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