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: (CNN) -- At the beginning of 2008, everything seemed set for Bill Clinton. His wife, Hillary, had the money and the endorsements to run for the presidency. She also had the experience and the talismanic Democratic last name. Everything was in place for Bill's return to the White House, this time as first gentleman. Then came Iowa, when the supposedly unstoppable Hillary for president locomotive was derailed by Barack Obama, a first-term senator from Illinois. Bill Clinton couldn't believe that this Johnny-come-lately might block his wife's path to the White House. Bill Clinton and Barack Obama may be making common cause now, but four years ago the future president drove the former president crazy.President Obama has actively embraced Bill Clinton for help on raising money and gaining votersMichael Takiff: Obama needs Clinton in his campaign, Clinton craves political relevanceHe says four years ago, Obama drove the former president crazyTakiff: Whatever his feelings toward Bill Clinton, Obama should listen to him 
 Question:Once the nomination fight ended, Hillary was quick to dismiss her ill feelings toward _.

Barack Obama