One might wonder how a case based completely around an entirely made-up story can get so far. The answer is simple: the media. The media dramatized the story to the point where people jumped to conclusions about the guilt of the boys.The media did this by bringing up un-related subjects like race and socio-economic status, by bringing in bias and preconceptions, and by some media outlets exaggerating the story to compete with others.
After the accusations, the stories released by major news outlets mentioned many things that weren't necessary for the reader to understand the story at all. For example, in an April 1st article, the New York Times called the lacrosse team "a clubby, hard-partying outfit with roots in the elite prep schools of the Northeast." Calling the team "hard-partying" and hinting at the average socio-economic status of Duke's students by using the word "elite", contributed nothing to the readers understanding of the story. What these things did do is make the reader likely to side with the accuser before any real evidence had actually been presented. The media knew what they wanted people to think and they made biased speculations to convince their readers.
Sometimes, the media dramatized the story just to compete with other news outlets' coverage of the same story. In the following clip, Nancy Grace uses an exaggerated tone to dramatize the Duke case.