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Surrounded by members of his family Republican presidential candidate, former Pennsylvania Sen. Rick Santorum announces he is suspending his candidacy effective today in Gettysburg, Pa., Tuesday, April 10, 2012. (AP Photo/Gene J. Puskar)

Surrounded by members of his family Republican presidential candidate, former Pennsylvania Sen. Rick Santorum announces he is suspending his candidacy effective today in Gettysburg, Pa., Tuesday, April 10, 2012. (AP Photo/Gene J. Puskar)

Rick Santorum concedes

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