Newt Gingrich and his wife, Callista, celebrate in Columbia, S.C.
Newt Gingrich and his wife, Callista, celebrate in Columbia, S.C. AP Photo/Paul Sancya
Newt Gingrich and his wife, Callista, celebrate in Columbia, S.C. AP Photo/Paul Sancya

Gingrich challenges Santorum's conservative creds, calls Romney unconvincing

March 04, 2012 4:54 PM