Good question: just how much did Jeb! Bush end up spending per vote in the Iowa caucuses? He began his campaign with money to burn, and for months, political cartoons have shown Bush doing just that, shoveling cash into a steam engine. Nate Silver, editor-in-chief of FiveThirtyEight, has a shocking estimate to report, with Bush standing at about 3 percent of the vote in Iowa with half of the votes reported.