US Election 2012: Newt Gingrich calls on Callista to burnish his tarnished image Having won a remarkable victory in the South Carolina primary last month, the 68-year-old has seen momentum swing once again behind Rick Santorum, the former Pennsylvania senator who won all three of this week's contests. Mr Gingrich's increasingly bitter attacks against Mr Santorum and Mitt Romney, the contest's front-runner, have done little to stabilise his campaign and appear to have repelled some undecided voters. While Mrs Gingrich has remained almost mute throughout the campaign so far, Ann Romney, the former Massachusetts governor's wife, has energetically campaigned for him around the country. While Mrs Romney frequently speaks of her husband's loyalty and commitment over 42 years of marriage, the Gingrich team has sought to play down his complex private past, including adultery. Mrs Gingrich also described her husband as an "enthusiastic and committed golfer" on Friday and appeared to draw a comparison between his sporting abilities and the volatile fortunes of his presidential campaign. "Newt golfs the way that he does everything: with enthusiasm and determination," she said. He's willing to learn and he never gives up.