Pennsylvania: Survey Sponsor: American Research Group, Inc. The American Research Group has been conducting surveys of voters since 1985. Sample Size: 400 completed telephone interviews among a random sample of likely Republican primary voters living in Pennsylvania (400 self-reported registered Republicans). Sample Dates: April 21-24, 2016 Margin of Error: ± 5 percentage points, 95% of the time, on questions where opinion is evenly split.
