The afternoon before Donald Trump’s blowout win in South Carolina’s primary, Shellie Hargenrader and Julianne Poulnot emerged from a rally for the former president bubbling with righteous conviction. They had spent the previous hour listening to the candidate’s son Donald Trump Jr. regale supporters at the campaign’s headquarters in an office park outside Charleston. The crowd had been energized, frequently calling out in response to his words as if at a church service as Trump Jr. lacerated President Joe Biden, the media, the multiple legal proceedings against his father and the punishment of the January 6 insurrectionists. “Trump is my president,” one man shouted. Hargenrader and Poulnot were still feeling that spirit when they stopped on their way out from the rally to talk with me. When I asked them why they were supporting Trump over Nikki Haley, the state’s former governor, they started with conventional reasons. “Because he did a great job and he can do it again,” Hargenrader told me. Poulnot cut in to add: “He stands for the people and he tells …