The group, called Right to Rise, is said to be on track for raising an historic $100 million by the end of May, and its budget is expected to dwarf that of Bush’s official campaign many times over. In interviews, more than half a dozen sources familiar with the Right to Rise plans described a juggernaut that was rapidly taking shape — from its likely headquarters in Los Angeles, 2,700 miles from the Miami office where Bush was basing his campaign, to a new fundraising push aimed at expanding its ballooning coffers…

Some opponents are growing increasingly concerned about how the group might be used to damage them.

“People are looking at that $100 million figure and wondering, ‘Is it going to be aimed at us?’” said a top adviser to a rival Republican campaign who spoke on the condition of anonymity to candidly describe internal discussions. “Any time you’re within a stone’s throw of the Bush campaign, you’re in the radius of the baseball bat.”…

Over the coming days, according to one person briefed on the Right to Rise plans, Bush will try to accelerate the cash flow. Hoping to avoid the public perception that he’d been indebted to a few extremely wealthy benefactors, the former governor initially imposed a $1 million cap on donations to the super PAC.