Pages

Showing posts with label North Carolina. Show all posts
Showing posts with label North Carolina. Show all posts

Tuesday, September 9, 2008

Major issues with SurveyUSA's North Carolina Polling Sample

SurveyUSA released a rather shocking poll today showing John McCain leading Barack Obama 58-38 in North Carolina, up from 4 points in the August poll.

They also recorded an 11 point gain for Republican Pat McCrory in the Governor's race, and a 3-point gain for Elizabeth Dole in the Senate race.

A lot of people might have thought, "Hey, maybe we messed something up here." Not SurveyUSA, though.

Republican John McCain suddenly and breathtakingly surges to a 20-point win over Democrat Barack Obama, 58% to 38%, according to this latest exclusive SurveyUSA election poll conducted for WTVD-TV. In 3 previous SurveyUSA NC tracking polls, McCain had led by 8, 5, and 4 points. Today: 20. McCain has gained ground in every demographic group.


Now, first of all, their claim is false. Obama led 71-25 among Democrats in August's poll; today, he leads 74-23.

That fact led me to look at the crosstabs for party affiliation; 41% Republican, 40% Democratic. I wondered if they were going by stated party affiliation or registered party affiliation; those numbers may be accurate for stated affiliation but they are way off for registered party affiliation.

So I took a look at the other 3 months polls that they've done, and it's clear: they've been polling by registered party affiliation.

In August: 46% Democratic, 33% Republican

In July: 45% Democratic, 37% Republican

In May: 49 % Democratic, 33% Republican

The Democratic registration edge in all 3 of the previous polls is within 4 points of the Democratic registration edge among registered voters in North Carolina.

Currently, 45.3% of North Carolina's registered voters are Democrats, 32.7% are Republicans (12.6% edge). This is a gain of 2 points for Democrats since January, when 44.8% were Democrats and 34.2% were Republicans (10.6 point edge)

My point is that this a really, really awful sample of voters. If you take the crosstab numbers by party registration for this poll and adjust them to reflect last month's poll, you get the following:

McCain 51, Obama 42 (still a 5 point gain; not insubstantial but not crazy either)

Hagan 44, Dole 42 (a 7 point gain for Hagan, in line with other polls we've seen from the state)

Perdue 45, McCrory 44 (a 2 point gain for McCrory, within the margin of error)

The point being: McCain may well be safe in North Carolina (and the Obama campaign may realize it as they've cut back resources there), but Dole isn't and Perdue's got a fighting choice.

Or rather, that's what this poll says.