When SurveyUSA asked Minnesota voters about an amendment to the state constitution to define marriage as between one man and one woman, home-phone respondents supported the amendment by 19 points, cell-phone respondents opposed the amendment by 10 points, a 29-point difference. SurveyUSA poll of 552 state of MN registered voters, released 05/24/11. 26% of registered voters are cell-phone respondents).

Polls that exclude cell-phone respondents, such as those conducted by many SurveyUSA competitors, risk mis-characterizing public opinion. SurveyUSA estimates that by Election 2012, half of voters age 25 to 34, and one-third of voters age 35 to 44, will not be reachable on a home-phone. Make certain the polls you commission, and the competing polls you analyze, properly account for cell-phone respondents.