Gravis Marketing conducted a survey of 1027 Iowa likely voters between Dec 19 and Dec 21, 2015. Respondents were contacted by Landline and the interaction was automated. The results of this poll were released on Dec 23, 2015.
Results were provided for the only publicly acknowledged question.
Question 4 | PreferenceView Matchup
Assuming you had to vote today, which 2016 Democrat Candidate would you vote for?
This question was presented to 418 likely voters from Iowa who were contacted in some undisclosed fashion. The margin of sampling error is ± 5%.
The question wording was provided by Gravis Marketing.