According to local media, Mr. Romney won 39.4% of the vote, ahead of U.S. Congressman Ron Paul (22.8%).
The former governor of Utah and U.S. ambassador to China, Jon Huntsman, came third with 16.8% of the vote, after a surprise defeat in the State of Iowa (0.6%).
Former Senator Rick Santorum, number two in Iowa, is in fifth position, just after Newt Gingrich, former Speaker of the House of Representatives (respectively 9.3% and 9.4%).
Texas Governor Rick Perry appears in the sixth position with 0.7% of the vote.