The surveys of voters in Michigan and Arizona's GOP presidential primaries were conducted for AP and the television networks by Edison Research. This includes preliminary results among 2,200 voters interviewed Tuesday as they left their polling places at 30 randomly selected sites in Michigan, and among 2,535 Arizona voters as they left 30 polling places. Included were 412 who voted early or absentee in Michigan and 601 in Arizona, who were interviewed by landline or cellular telephone from Feb. 20-26.
The Michigan survey has a margin of sampling error of plus or minus 4 percentage points, while the Arizona exit poll had a margin of sampling error of plus or minus 3 percentage points.
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