Mr. Bush’s father, his mother, his wife and even his son have raised money for his campaign or for his “super PAC,” tapping into a family donor network that began as his mother’s Christmas card mailing list. And now an invitation to Walker’s Point, for decades the ultimate V.I.P. room in Republican politics, is Mr. Bush’s to bestow.

On Monday, he invited the last Republican presidential nominee, Mitt Romney, to Walker’s Point for lunch, hoping to soothe lingering hurt over what Mr. Romney’s supporters considered a desultory endorsement of their candidate in 2012. On Thursday, a visit to the compound was the prize for members of the vaunted Bush fund-raising operation, who arrived to the news that they had amassed about as much money as the rest of the Republican field and their super PACs combined. Marking the day, they gathered with the Bush family for a group photo.

Such donor retreats have become a routine feature of presidential campaigns, all the more important as the price tag for a major-party candidacy breaks the $1 billion mark. They are intended to reflect some actual or projected essence of the candidate: Hillary Rodham Clinton gathered her top fund-raisers in May at a Brooklyn warehouse, for example, while Mr. Romney invited top donors for annual hikes and foreign policy lectures at the Stein Eriksen Lodge Deer Valley in Park City, Utah, a favorite destination of his family.