Dear South Carolinians, It’s been four years since your last presidential primary - and four years is an evolutionary eternity when it comes to Mitt Romney. So I’m here to help you decipher the 2012-model Mitt. What’s happened to his necktie? And why is he wearing jeans instead of a fancy suit? Don’t worry. Mitt hasn’t fallen on hard times. Dressing down is his way of signaling he’s just folks. Don’t be surprised if, by the weekend, he’s sporting a tin of Skoal in his pocket.