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)Former Florida Gov. Jeb Bush's surprise announcement that he'll "actively explore" a presidential bid Tuesday morning did little to dissuade his potential Republican opponents from the race. Following the news, South Carolina Sen. Lindsey Graham, who might make a White House bid, offered the clearest pitch yet for his own candidacy. "I think I have a unique ability to deal with the threats we face at home and abroad and the challenges here, which is finally getting the government to work and dealing with a dangerous world," he told reporters on Capitol Hill. He said to "stay tuned" for his plans.Sen. Rand Paul welcomed Bush into the race: "The more the merrier!"A spokesman for Sen. Marco Rubio said Bush's decision would have no impact on his ownSen. Ted Cruz said the voters would decide on their eventual nominee 
 Question:None of the _ senators noted one of Bush's biggest liabilities in a GOP presidential primary, however — his support for policies anathema to conservative Republicans.

Republican