Question:

About this Poll
Interviews with 2,009 adult Iowans conducted by telephone by ORC
International on October 29-November 4, 2015. The margin of sampling
error for results based on the total sample is plus or minus 2 percentage
points.
The sample also includes 548 who were likely to participate in the
Republican presidential caucus and 498 who were likely to participate in
the Democratic presidential caucus.
This sample includes 1,209 interviews among landline respondents and 800
interviews among cell phone respondents.