Last night's NBC/WSJ poll includes a sub-group that has talking-heads worked up in a tizzy: among "white suburban women," the poll shows McCain defeating Obama 44 percent to 38 percent, even though Obama beats McCain among women generally by a 52-33% margin.
But the numbers are flimsy.
Singer called foul this early this morning, and now the Huffington Post confirms it (emphasis mine):
MSNBC has now provided The Huffington Post with more information on its "suburban women" finding showing a 44-38 McCain lead over Obama. "This is within the margin of error of 9.34 percent based on a sample size of 110 within the larger poll," an MSNBC source wrote over email. (That's three times the margin of error for the entire poll.) This means McCain's 44 percent figure of support among suburban women could actually be as low as 35 percent, while Obama's 38 percent figure could rise as high as 47 percent. Alternatively, McCain could be leading Obama 53-29. Bottom line: that much variance renders the finding of little statistical use.
So this new conventional wisdom is based on a poll of 110 people with a margin of error approaching a whopping 10%. These numbers can't be trusted.
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