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Last week's lesson on polling

One disappointing performer in Tuesday's GOP primaries was SurveyUSA. In the GOP Senate primary, the final SurveyUSA poll of Kansans had Jerry Moran beating Todd Tiahrt by 10 percentage points; the margin was actually only 5 points. In the 4th Congressional District, SurveyUSA had Mike Pompeo and second-place Jean Schodorf separated by 7 percentage points; at the real polls, Pompeo won by 15. In the 1st Congressional District, what SurveyUSA had as a dead heat between Jim Barnett, Tracey Mann and Tim Huelskamp (24 percent each) was actually a 10-point Huelskamp blowout over second-place Barnett.