"May 10, 2016 - Clinton-Trump Close In Florida, Ohio, Pennsylvania, Quinnipiac University Swing State Poll Finds"
From April 27 - May 8 Quinnipiac University surveyed:
1,051 Florida voters with a margin of error of +/- 3 percentage points;
1,042 Ohio voters with a margin of error of +/- 3 percentage points;
1,077 Pennsylvania voters with a margin of error of +/- 3 percentage points.