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: Former Florida Gov. Jeb Bush will run for president in 2016, according to several senior aides who confirmed Thursday that the Republican would announce his widely expected decision in Miami later this month. As the son of one president and brother of another, Bush would be the third member of his immediate family to sit in the Oval Office if elected. His decision to run ensures the possibility of a general election showdown between two political families as Hillary Rodham Clinton eyes the Democratic presidential nomination. Bush senior aides confirmed that the 62-year-old Bush, who left the Florida governor's mansion in 2007, will enter the race during an event at Miami Dade College soon after returning from a weeklong European trip. The aides spoke on condition of anonymity to discuss the decision ahead of the formal announcement.Former Florida Gov. Jeb Bush will run for president in 2016, according to several senior aidesThey confirmed Thursday that the Republican would announce his widely expected decision in Miami later this monthAs the son of one president and brother of another, Bush would be the third member of family to sit in the Oval Office if electedBush senior aides confirmed that Bush will enter the race during an event at Miami Dade College soon after returning from a weeklong European trip 
 Question:Yet he faces considerable resistance from the party's conservative flank, which holds outsized influence in the _ presidential primary process.

Republican