Nikki Haley may have been the big winner in South Carolina Tuesday, but she isn’t the only Republican whose star is rising in an early state that is key to winning the GOP presidential nomination. Both Mitt Romney, the former governor of Massachusetts, and Sarah Palin, the former governor of Alaska, were also winners in the 2012 sweepstakes. They got behind Haley at critical junctures in her campaign for governor while the rest of the potential GOP presidential field either endorsed another candidate or stayed out of the fray completely. . . . . . . Former Arkansas Gov. Mike...