Nikki Haley headed to South Carolina Wednesday and announced a new big-money Wall Street fundraiser even as former President Donald Trump crowned himself the presumptive Republican presidential nominee after he won the New Hampshire primary. On the day after Trump notched a healthy 11% win in the Granite State, Haley insisted her strong second-place showing means it’s game on in the GOP primary, which moves on to South Carolina in a month’s time. “The political class wanted us to believe that this race was over before it even began,” she tweeted late Tuesday. “Our fight is not over, because we…