Rick Santorum concedes

Associated Press
FILE - In this March 28, 2012 file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles at a bowling alley in La Crosse, Wis. Woe is Rick Santorum. The Republican presidential candidate complains that Mitt Romney and his allies are outspending him. He laments that he doesn’t have a beefy organization like the GOP front-runner. He insists that Romney is trying to change the rules of the campaign in the middle of it. And he says the former Massachusetts governor’s ads aren’t fair.  It’s not easy being Santorum. And he’s telling everyone who will listen.  (AP Photo/Jae C. Hong, File)

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Rick Santorum called Mitt Romney Apr. 10 to say he is ending his presidential campaign, Yahoo News has learned.

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