Rick Santorum concedes

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum chats with a supporter as he gets ready to bowl in Chilton, Wis., Sunday, April 1, 2012. Santorum outlined plans to leave Wisconsin the day before the state's contest Tuesday, an indication that the conservative favorite may be in retreat, his chances to stop Romney rapidly dwindling.  (AP Photo/Jae C. Hong)

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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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