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: Don't look now, Donald, but Ben is breathing down your neck. That's the message from a new NBC News/Wall Street Journal poll released Sunday morning. It shows GOP real estate titan Donald Trump with just a 1-percentage-point lead over retired neurosurgeon Ben Carson among a smallish sample of Republican voters. Trump won the support of 21 percent, compared with Carson's 20. Florida Senator Marco Rubio, the latest candidate to make a surge, shares third place with former tech CEO Carly Fiorina. Each had 11 per cent. When pollsters added the survey respondents' first and second choices together, the doctor overtakes the billionaire by 4 points, 35 to 31. Fiorina, the GOP field's lone female, is close behind with 28.Trump 21, Carson 20, Fiorina 11, Rubio 11, Bush 7When Republicans' first and second choices are combined, Carson leapfrogs Trump by 4 pointsClinton 42, Sanders 35, Biden 17Results shows massive indecision among Democrats as a CNN poll on Thursday had Sanders leading her by 16 pointsPollsters found that putting Biden in the mix largely pulls support away from Clinton, with Sanders relatively unaffected 
 Question:When Biden's name was removed from the list of choices, _'s lead grew to 15 points.

Clinton