Given the task definition and input, reply with output. 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].

Washington (CNN) -- Almost two-thirds of Iowa's Republican political pros predict that former Massachusetts Gov. Mitt Romney will win the state's caucuses on Tuesday, but his campaign's margin for error over Texas Rep. Ron Paul is slim. As the candidates dashed around the state making their closing arguments to a volatile caucus electorate, CNN surveyed 64 Iowa GOP insiders -- including state legislators, local elected and party officials, senior advisers to Republican Gov. Terry Branstad, business and conservative interest group leaders, veterans of previous caucus campaigns, and a variety of other party activists -- to assess the shape of the GOP race.CNN surveyed 64 Iowa GOP political insiders days before the historic caucusesTwo-thirds say that Mitt Romney will win on TuesdayInsiders also feel Ron Paul will finish in second place 
 Question:"_'s supporters don't care that he can't win," cracked another.

Ron Paul