Poll Watch: Des Moines Register Iowa 2014 Republican Senatorial Primary Survey

Des Moines Register Iowa 2014 GOP Senate Primary Poll

• Joni Ernst 36%
• Mark Jacobs 18%
• Matt Whitaker 13%
• Sam Clovis 11%
• Scott Schaben 2%
• Undecided 16%

Note: The victor needs at least 35 percent to win Tuesday's five-person primary outright.

Survey of 400 likely GOP primary voters was conducted May 27-30, 2014 by Selzer & Co. The margin of error is +/- 4.9 percentage points.