Nikki Haley insisted Tuesday she won’t quit even if she loses to former President Donald Trump in today’s New Hampshire primary. As the former U.N. ambassador raced across the state hunting an upset, she vowed to fight on against Trump in her home state of South Carolina and beyond. “We are going on to South Carolina,” Haley told reporters at a campaign stop. “This has always been a marathon. It’s never been a sprint.” She sharply pushed back at Trump’s suggestion that she should quit. “I don’t do what he tells me to do,” she added. Haley’s campaign underlined her determination to stay in the …