What is the fine-grained topic of the following text: Amid a new scandal Debbie Wasserman Schultz was left no alternative but to step down from her role as the Chairwoman to the DNC, the Democratic National Committee, in seeking to sabotage Bernie Sanders’ challenge to Hillary Clinton for the nomination. Only return the topic.
Debbie Wasserman Schultz's resignation as DNC Chairwoman due to a scandal involving Bernie Sanders' nomination challenge to Hillary Clinton.