Rick Santorum

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From left, former Sen. Rick Santorum of Pennsylvania; Rep. Michele Bachmann of Minnesota; former House Speaker Newt Gingrich of Georgia; former Massachusetts Gov. Mitt Romney; Rep. Ron Paul of Texas; former Minnesota Gov. Tim Pawlenty; and businessman Herman Cain greet the audience before first New Hampshire Republican presidential debate, at St. Anselm College in Manchester, N.H., Monday. (Associated Press)

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Associated Press With a courthouse in Somerset, Pa., as backdrop, former Sen. Rick Santorum of Pennsylvania announces he is entering the crowded field for the 2012 Republican presidential nomination. He criticized President Obama as having put the country on a path to moral and fiscal ruin.

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Former Sen. Rick Santorum of Pennsylvania works the crowd after announcing he is entering the Republican presidential race on Monday, June 6, 2011, at the Somerset County Courthouse in Somerset, Pa. (AP Photo/Gene J. Puskar)

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Former Sen. Rick Santorum, Pennsylvania Republican, is participating in candidates forums in New Hampshire as another presidential hopeful. He is among the favorites of social-issues conservatives.

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Rick Santorum is setting up a fundraising committee that allows him to take the first steps toward a 2012 presidential campaign. (Associated Press)

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Former Pennsylvania Sen. Rick Santorum gives an interview to the Associated Press in Washington in December 2010. Mr. Santorum said on Wednesday, April 13, 2011, that he is forming a committee that will let him start raising money for a White House run. (AP Photo/Manuel Balce Ceneta)