By MICHELLE L. PRICE, JONATHAN J. COOPER and GABE STERN Associated Press LAS VEGAS — Former President Donald Trump won Nevada’s Republican presidential caucuses Thursday after he was the only major candidate to compete. Former U.N. Ambassador Nikki Haley skipped the caucuses, which are the only contest in Nevada that counts toward the GOP nomination. Haley cited what she considered an unfair process favoring Trump and instead ran in Nevada’s symbolic state-run presidential primary on Tuesday, when she finished behind the “none of these candidates” option. Trump’s win in Nevada gives him all 26…