at a time when voters despised the political and economic establishment that his family name embodies. Maria Losito, 65, and her husband, Frank Losito, 65, retirees in Palm City, Fla., said they could not quite bring themselves to support Mr. Bush. “The father was president, the brother was president,” said Ms. Losito. “How do I trust him that he’s going to change things that his father and brother didn’t?” But Mr. Losito said he felt for Mr. Bush. “It’s sad in way,” he said, “because he’s pouring all this money in, and he’s not getting anywhere. His message is not getting out.” The long, slow tumble within the Republican campaign was a nightmare scenario for Mr. Bush, who was skeptical about whether to enter the race in the first place.