When President Joe Biden began his campaign trip in Las Vegas last week, everything seemed to be running as smoothly as it could for an 81-year-old president in physical and cognitive decline. The day before he abruptly left town, Biden delivered the keynote address in front of a packed crowd of almost five thousand people at the NAACP National Convention at the Mandalay Bay hotel. On Wednesday, Biden was scheduled to deliver the keynote at the UnidosUS annual convention at the MGM Grand, with thousands in attendance anticipating his arrival. With the venue located right off the Las Vegas Strip,...