Jon Huntsman withdraws from race for Republican presidential nomination Jon Huntsman speaks to local voters as his wife Mary Kaye listens at Crosby's Bakery during a campaign stop in Nashua, New Hampshire. Photograph: Alex Wong/Getty Images Jon Huntsman is planning to quit the Republican presidential race on Monday after trailing badly in the polls in South Carolina, according to his aides. Huntsman is expected to endorse the front-runner Mitt Romney. His departure narrows the field to five: Romney, former House Speaker Newt Gingrich, former senator Rick Santorum, Texas Congressman Ron Paul and Texas governor Rick Perry. They face Republican voters in the South Carolina primary on Saturday where Perry, unless his campaign enjoys an unexpected revival in the remaining few days, may be the next casualty. Huntsman, who had been due to take part in a presidential debate in Myrtle Beach on Monday night, was bowing to the inevitable. He found his politics did not resonate in a Republican party that has moved rightwards in recent years. He opted against competing in Iowa earlier this month, viewing the state to be too conservative to give him a chance. He concentrated all his efforts instead on New Hampshire, needing at least a second place finish last Tuesday. He came third. Defying predictions he would quit then, he gamely boasted that third place was good enough and he would take his campaign to South Carolina. But, since arriving in the state on Saturday morning, he has made little impression. One of the biggest embarrassments for him was to find himself behind even Stephen Colbert, who won the support of 5% in a poll, to Huntsman's 4%. Huntsman joins the list of Republican presidential casualties that began with the departure of former Minnesota governor Tim Pawlenty in August, followed by pizza mogul Herman Cain in December, and Michele Bachmann after the Iowa caucuses earlier this month. He is expected to call on the party to unite behind Romney. Even without his endorsement, his small band of supporters were more likely to go over to Romney rather than one of the candidates on the right. One of Huntsman's campaign managers, Matt David, told the New York Times: "The governor and his family, at this point in the race, decided it was time for Republicans to rally around a candidate who could beat Barack Obama and turn around the economy. That candidate is governor Mitt Romney. He may formally endorse Romney in Myrtle Beach, where the candidates are gathering for the Fox debate on Monday night. Huntsman, like Romney a Mormon, was former governor of Utah and former ambassador to China, a job he was offered by Obama, a move that damned Huntsman in the eyes of many Republican voters. One of his problems during the campaign was his mixed messages, trying to be both the most moderate candidate in the field while claiming to be the most conservative, confusing Republican voters. He has a personal fortune estimated at $50 million. His father's fortune is estimated at $900 million but Huntsman junior said he had avoided asking his father for financial help. Huntsman may treat 2012 as a dry run for another attempt in 2016.