How did Rubio win Nevada? The state GOP loves Trump with all his casinos and there are lots of non college-educated whites. Trump won easily there IOTL.
Because Rubio passed a part of his childhood in Las Vegas. In addition, Rubio created a coalition of Hispanics and Mormons, which helped to win Nevada just like Mitt Romney largely won Nevada twice in 2008 and 2012 due to his strong performance among Mormons. Plus, Trump is not the only candidate with connections with Nevada casinos : Rubio's father worked as a bartender at the Sam's Town Hotel and her mother worked as a housekeeper at the Imperial Palace Hotel and Casino. And also, because of Rubio's early victories in Iowa and South Carolina, he made progress in the polls in the Silver State. By the way, Rubio is endorsed by Nevada Governor Brian Sandoval.
But Nevada was one of Trump's best states in the primary.