Polling Averages Can Sometimes Be Misleading Too

Stuart Rothenberg: “On Election Day 2012, the RealClearPolitics polling average found incumbent President Obama “leading” Republican Mitt Romney by seven-tenths of a point – a statistical dead heat. The actual final result, an Obama victory of 3.9 points, was very different.”

“I cite these numbers not to challenge the RCP average or disparage the pollsters who got the race wrong… Still, the 2012 ‘miss’ should remind us that polling isn’t perfect and even ‘averaging,’ a reasonable strategy, can mislead. Averaging may smooth outliers, but what if one poll always seems to be an outlier, like the Los Angeles Times/USC tracking poll?”