By Tzvi Machlin No sport in America attracts larger crowds than college football games and just about every FBS stadium can fit the population of several small towns into them. That’s what makes one recent attendance video so embarrassing. During yesterday’s game between Stanford and Arizona State, Jim Nagy shared a video of the Cardinals coming onto the field for their pregame ceremony. But there was one huge problem: Massive swaths of the stadium were completely empty. “Someone in Cali please explain what else, besides football, people are doing on Saturday afternoons in the fall. Whatever i…