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About this Poll
The Marquette Law School Poll is the most extensive statewide polling project in Wisconsin history. This poll interviewed 802 registered Wisconsin voters, by both landline and cell phone, August 13-16, 2015. The margin of error is +/- 4.3 percentage points for the full sample. For Republicans and independents who lean toward the Republican Party, the sample size is 334, with a margin of error of +/-6.6 percentage points. For Democrats and independents who lean toward the Democratic Party, the sample size is 396, with a margin of error of +/-6.1 percentage points. Republican and Democratic presidential primary items were asked of the corresponding party samples.

The partisan makeup of this sample, including those who lean to a party, is 42 percent Republican, 48 percent Democratic and 9 percent independent. The long-term estimate over the previous 28 statewide Marquette polls with 24,319 respondents is 43 percent Republican and 47 percent Democratic, with 9 percent independent. The partisan makeup excluding those who lean to a party is 27 percent Republican, 28 percent Democratic and 42 percent independent, compared to the long-term estimate of 27 percent Republican, 31 percent Democratic and 38 percent independent.