It's been more than a decade since Iowa has had a Democratic governor or senator. But this year, with the incumbents retiring, both races are competitive. As Peter Tubbs at Iowa PBS reports, record-high diesel prices have hit the state's agriculture industry particularly hard and could influence the midterm elections. Geoff Bennett: It's been more than a decade since Iowa has had a Democratic governor or senator, but this year, with the incumbents retiring there, both races are competitive.