The latest CNN/ORC poll released today shows a wider lead for President Obama than the previous CNN/ORC poll but it is doubly skewed. It massively under-samples independents while it also over-samples Democratic voters. The CNN/Opinion Research Corp. poll official reports Obama at 52 to percent and Mitt Romney at 46 percent. Unskewed, the data reveals a 53 percent to 45 percent lead for Romney.
This new CNN/ORC survey, unlike many other analyzed, not only over-samples Democratic voters, but also massively under-samples independent voters, to produce a result more favorable to Barack Obama. This survey’s sample includes 397 registered Republicans and 441 registered Democrats. But the survey included a total of 822 registered voters, leaving only 37 independent voters at most. The survey clearly under-sampled independent and Republican voters.
Among the Democrats survey, 97 percent favored Obama while three percent support Romney. The Republicans surveys chose Romney by a 96 percent to two percent margin. Those margins display a high degree of party loyalty in each party for its candidate, which is plausible in a campaign like this one where both sides are focusing heavily on boosting turnout among their base. Independents, who are massively under-sampled in this survey, support Romney by a 54 percent to 40 percent margin.
The sample for the CNN/ORC poll includes 50.4 percent Democrats and 45.4 percent Republicans and appears to have only 4.2 percent independents. This means independents are under-sampled 25 percent while Democrats are over-sampled 12.1 percent. Both of those are larger variations in sampling than seen in most polls that are likewise skewed by such sampling variations.
Loading ...
