With a primary win all but inevitable, President Joe Biden used his Sunday appearance in Las Vegas’s Historic Westside to rally his most vocal supporters in a battleground state that delivered for him four years ago. In a roughly 30-minute speech at Pearson Community Center, Biden mentioned Tuesday’s presidential preference primary only in passing, instead using his time to highlight the achievements of his first term and scourge former President Donald Trump, who appears poised to secure the Republican nomination over challenger Nikki Haley. “You all are the reason I am the president of the U…