Strijd tussen de Republikeinse presidentskandidaten komt in Iowa op gang

DUBUQUE, IA - DECEMBER 27: The campaign bus carrying Republican presidential candidate former Speaker of the House Newt Gingrich departs a campaign stop at the Dubuque Golf and Country Club on December 27, 2011 in Dubuque, Iowa. The GOP presidential contenders are crisscrossing Iowa in the final stretch of campaigning in the state before the January 3rd caucus, the first test the candidates must face before becoming the Republican presidential nominee. Scott Olson/Getty Images/AFP == FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY == AFP