An enormous crowd of more than 20,000 peopled showed up for Bernie Sanders' rally in Oakland, California on Memorial Day, but this number may be underestimating the attendance. According to different people who talked to the Oakland Police, the estimated numbers ranged from 30,000 to even 60,000 when counting the thousands of people who overflowed into the streets because they couldn't fit in Ogawa Plaza. Many people who attended told Heavy that the police mentioned that the crowd, including overflow, clocked in near 60,000, but the official count has not yet been released from Sanders' campaign. A crowd that big even attracted protestors, but they were quickly arrested by Secret Service. If the crowd is any indication, Hillary Clinton might be seeing a big upset in the California primary on June 7. Click through the gallery to see more photos from the rally, which might have been one of Bernie's biggest rallies yet. (Getty)