Jeb Bush is struggling in Iowa, but his campaign isn't giving up. Showing off the strength of the massive fundraising effort undertaken earlier this year that resulted in over $100 million in funds raised to support the former Florida governor's presidential bid, the campaign spent $5.89 million on Iowa advertising purchases this week, with more ad buys expected to come. "It's a muscular buy for a muscular story," Mike Murphy, the chief strategist for Right to Rise USA, the super PAC supporting Bush that bought the ads, told the Des Moines Register.