http://www.slate.com/articles/news_and_politics/politics/2015/10/clinton_won_the_democratic_debate_by_going_on_offense.html

LAS VEGAS—Hillary Clinton came into the first Democratic presidential debate as the front-runner, and for perhaps the first time in the campaign, she looked like one. She was commanding on the issues and attacked Republicans in a way that was pleasing to Democrats and deflected the attacks aimed at her. If Joe Biden needed Clinton to falter to create a further appetite for his campaign, her performance seemed to have the opposite effect.