Over Phones and Greasy Pizza, a Battle for Iowa.

DES MOINES -- A few days before the Iowa caucuses, Newt Gingrich's campaign headquarters just outside the city is a spectacle of pre-computer-age disorder, with volunteers rushing voter updates across the room on yellow Post-it notes. At the offices of Mitt Romney, who has built a ground organization aimed at matching the intensity of his television advertising barrage, aides are methodically analyzing data on each voter to create the perfect pitch: those worried about illegal immigration, for example, are invited to join a conference call with a border county sheriff in Arizona. [ABSTRACT FROM AUTHOR]