Former House Speaker Newt Gingrich, with wife Callista, speaks at a rally on Saturday night, Jan. 21, 2012, in Columbia, S.C., after Mr. Gingrich won the state's GOP presidential primary. (AP Photo/Matt Rourke)
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Former House Speaker Newt Gingrich, with wife Callista, speaks at a rally on Saturday night, Jan. 21, 2012, in Columbia, S.C., after Mr. Gingrich won the state's GOP presidential primary. (AP Photo/Matt Rourke)
