President Joe Biden canceled a planned speech at UnidosUS’ annual conference in Las Vegas, due to a positive test for COVID-19. According to CNN, the audience let out “audible gasps” when this was revealed to conferencegoers. This is not the first time the president has been diagnosed; he also tested positive for COVID last September, along with the First Lady, forcing them to isolate. Want more breaking political news? Click for the latest headlines at Raw Story. ALSO READ: Associated Press issues warning about iconic Trump assassination attempt photo Former President Donald Trump himself fam…