Former House Speaker Newt Gingrich, campaigning for the GOP presidential nomination, autographs a book before a stop at Global Security Services in Davenport, Iowa, on Monday, Dec. 19, 2011. (AP Photo/Chris Carlson)

Photo by: Chris Carlson

Former House Speaker Newt Gingrich, campaigning for the GOP presidential nomination, autographs a book before a stop at Global Security Services in Davenport, Iowa, on Monday, Dec. 19, 2011. (AP Photo/Chris Carlson)