Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Philadelphia (CNN) The Democratic A-list on Wednesday cast Donald Trump as a threat to the American dream -- and Hillary Clinton as the nation's only chance to save it. President Barack Obama called Trump a "homegrown demagogue." Michael Bloomberg dismissed him as a "con." And Vice President Joe Biden, in rejecting Trump, declared that "Americans have never, ever, ever, ever let their country down." How Obama made some anti-Trump Republicans jealous They set the frame for the Democratic National Convention's most important moment: Clinton's speech Thursday night. Here are six takeaways from the third night in Philadelphia: Obama: 'the America I know'President Obama gave a strong endorsement of Hillary Clinton and denounced Donald TrumpJoe Biden and Michael Bloomberg also used speeches to take down Trump 
 Question:From a video introduction that focused on the work left to do to achieve _'s vision, the President made clear that Clinton is the only person capable of solidifying his legacy.

Barack Obama