Former House Speaker Newt Gingrich, a GOP presidential hopeful, is seen through a window on a door as he spoke to students at the University of Iowa College of Public Health in Iowa City on Wednesday. Mr. Gingrich has been criticized for a $500,000 jewelry bill at Tiffany's. (Associated Press)

Former House Speaker Newt Gingrich, a GOP presidential hopeful, is seen through a window on a door as he spoke to students at the University of Iowa College of Public Health in Iowa City on Wednesday. Mr. Gingrich has been criticized for a $500,000 jewelry bill at Tiffany's. (Associated Press)