Newt Gingrich speaks at Marquette University in Milwaukee on March 29. Rick Wood/MCT/Landov hide caption

itoggle caption Rick Wood/MCT/Landov

Newt Gingrich waves to supporters as he leaves a campaign stop in Buffalo, N.Y., last week. David Duprey/AP hide caption

itoggle caption David Duprey/AP

Gingrich supporters received an email offering a discount on identity theft protection. Newt 2012 hide caption

itoggle caption Newt 2012

Former House Speaker Newt Gingrich, who wants to the the 2012 Republican presidential nominee, during a campaign event in Camp Hill, Pa., on Saturday (March 24, 2012). Jessica Kourkounis/Getty Images hide caption

itoggle caption Jessica Kourkounis/Getty Images

Former House Speaker Newt Gingrich. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images

After his losses in Alabama and Mississippi on Tuesday, Newt Gingrich will face increasing pressure to drop out of the GOP race. Here he waves to supporters after speaking at a rally in Hoover, Ala., on Tuesday. Marvin Gentry /Reuters /Landov hide caption

itoggle caption Marvin Gentry /Reuters /Landov

Republican candidate Newt Gingrich is counting on his promise of $2.50-per-gallon gas to return him to front-runner status. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP