His campaign started out stuffed with money. By last July, Jeb Bush had raised $103 million for his super PAC, Right to Rise, an astonishing sum that seemed to foretell the most lavishly funded campaign in American history. No super PAC had ever raised so much cash so early in an election cycle. In fact, Right to Rise alone outraised all the super PACs combined at the same stage in the 2012 elections. Now, after primary elections in just three states, Bush is out. He finished sixth in the Iowa caucus, fourth in the New Hampshire primary, and now, fourth...