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: Washington (CNN) The GOP has a serious case of the June jitters. The cause? A presumptive presidential nominee whose standing with key voting blocs -- and in key battleground states -- is in decline and who has failed to deliver on frequent promises to follow a somewhat more traditional campaign course. The worries were deepening even before the Orlando nightclub tragedy and have grown more profound since, as veteran Republican officials in Washington and around the country talk not only about Donald Trump's recent troubles as a candidate but the potential, in their view, for a damaging "Trump effect" on other Republican candidates.The worries were deepening even before the Orlando nightclub tragedy and have grown more profound sinceGOP officials talk not only about Trump's recent troubles but the potential for a damaging "Trump effect" 
 Question:But they are worried nonetheless, readily conceding that if _ loses their state by more than 3 to 5 five points it will be difficult for the incumbent not to get swept away.

Donald Trump