Former Pennsylvania Sen. Rick Santorum, accompanied by his wife, Karen (center right), son Daniel (left) and daughter Elizabeth (second left), speaks during a primary night rally on Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)

Photo by: Matt Rourke

Former Pennsylvania Sen. Rick Santorum, accompanied by his wife, Karen (center right), son Daniel (left) and daughter Elizabeth (second left), speaks during a primary night rally on Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)