Source for Popular Vote data: Iowa Secretary of State. June 3, 2014 Primary Election: US Senator - Rep, Iowa Secretary of State (http://electionresults.sos.iowa.gov/Views/TabularData.aspx?TabSRace=SpecifyARace%5ERaces%5E0%5E0%5E0%5EU.S.%20Senator%20) (accessed 04 Jun 2014)