Republican presidential candidate, former House Speaker Newt Gingrich waits to be introduced during a campaign stop on Monday, Feb. 20, 2012 in Oklahoma City, Okla. (AP Photo/Evan Vucci)

Associated Press
Republican presidential candidate, former House Speaker Newt Gingrich waits to be introduced during a campaign stop on Monday, Feb. 20, 2012 in Oklahoma City, Okla.  (AP Photo/Evan Vucci)
Republican presidential candidate, former House Speaker Newt Gingrich waits to be introduced during a campaign stop on Monday, Feb. 20, 2012 in Oklahoma City, Okla. (AP Photo/Evan Vucci)
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