Monmouth University Polling Institute conducted a survey of 401 Iowa likely voters between Jul 8 and Jul 11, 2016. Respondents were contacted by either Cellphone or Landline and instructed by a live operator. The results of this poll were released on Jul 12, 2016.

Results were provided for each of the 2 publicly acknowledged questions along with the order in which they were presented.

Question 1 | PreferenceView Matchup

If the election for President was today, would you vote for Donald Trump the Republican, Hillary Clinton the Democrat, Gary Johnson the Libertarian, or Jill Stein of the Green Party? [ IF UNDECIDED: If you had to vote for one of the following candidates at this moment, who do you lean toward Donald Trump or Hillary Clinton?] [ NAMES WERE ROTATED ]

This question was presented to 401 likely voters from Iowa who were contacted in some undisclosed fashion. The margin of sampling error is ± 4.9% at the 95% confidence level.

The question wording was provided by Monmouth University Polling Institute.

Question 2 | PreferenceView Matchup

If the election for U.S. Senate was today, would you vote for Chuck Grassley the Republican or Patty Judge the Democrat? [ IF UNDECIDED : If you had to vote for one of the following candidates at this moment, who do you lean toward - Chuck Grassley or Patty Judge?] [ NAMES WERE ROTATED ]

This question was presented to 401 likely voters from Iowa who were contacted in some undisclosed fashion. The margin of sampling error is ± 4.9% at the 95% confidence level.

The question wording was provided by Monmouth University Polling Institute.