SUMMERVILLE, S.C. — While Nikki Haley has, until recently, run a fairly positive campaign, she has endured relentless criticism from former President Donald Trump and others in his orbit. Her 22-year-old son, Nalin Haley, is not so inclined to pull his punches. Nalin Haley, who has become a more familiar presence on the trail with his mother, introduced her at events over the weekend, taking some pointed jabs at her onetime Republican rivals. He has a nickname for Sen. Tim Scott: Sen. Judas. Ano