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: Charlotte, North Carolina (CNN) -- Negative, expensive campaigns is something Sen. Kay Hagan is getting an education in this year. And something Hillary Clinton knows very well. Clinton campaigned Saturday for her fellow Democrat at a Charlotte rally of about 1,800 supporter. The former U.S. senator and secretary of state -- and widely presumed 2016 presidential contender -- used her appearance for Hagan to decry Thom Tillis, the Republican looking to unseat Hagan in November, as someone who will answer to big business, not raise the minimum wage and slash education funding. And unlike other appearances Clinton has made on the midterm campaign trail, the former first lady spent a portion of her speech Saturday decrying the level of outside spending in the Hagan-Tillis race.Hillary Clinton decries outside money in campaigns at an appearance in North CarolinaSenate race between Democrat Kay Hagan, GOP's Thom Tills is nation's most expensive"You have to prove them wrong," Clinton urges the crowdHagan criticizes "out-of-state billionaires" who are "trying to buy this election" 
 Question:At a focus group of ten North Carolina moms earlier this week, the negative ads were one of many reasons that the women said they were tuning out the _ race.

Hagan-Tillis