Gallop Poll shows Romney leads by a wide margin as other polls show tight race
(Reuters) - The election between President Barack Obama and Republican challenger Mitt Romney looks like it will be a knuckle-biter - unless you go by one of the United States' most respected public-opinion polls.
As most surveys show Obama and Romney locked in a virtual dead heat, Gallup finds that the Republican would win by a comfortable six percentage points if the election were held today.
Questions about the gap between Gallup's findings and those of other pollsters is the latest fuss this election season over polling methodology as partisan passions come to a boil in the heated final weeks before the November 6 presidential contest.
With a record of correctly predicting all but three of the 19 presidential races stretching back to 1936, Gallup is one of the most prestigious names in the business and its outlier status has other polling experts scratching their heads.
The contrast between Gallup and other major polls is stark.
As of Friday afternoon, Gallup's daily tracking poll of likely voters had Romney leading Obama by six percentage points, 51 percent to 45 percent.
There are many possible reasons for variations. Gallup's tracking poll relies on a seven-day rolling average, so it may still be registering a surge that Romney gained after his strong debate showing on October 3.
Several experts suggested that there may be something in the way the Gallup telephone survey is conducted that makes it more likely to translate a surge in enthusiasm for a candidate into an uptick in poll support, leading to wider swings in the final months before election day.
And there is a growing recognition in the industry that telephone-based surveys are becoming less reliable. As mobile phone use increases, a traditional home-phone survey will miss large chunks of the population, especially younger people.
But cell phones come with their own set of problems. Users often adopt an area code from another state and they may be less likely to answer calls from people they don't know.
Yet that might not explain any discrepancy in polls by Gallup, which now relies on an equal balance of home phones and mobile phones for its surveys.
No matter the method, polling firms weight the answers of those who respond to reflect the general composition of the U.S. voting population as a whole. If a pollster has trouble getting enough older Hispanic women, for example, the responses of those who do participate will be counted more than once. But weighting a sample too heavily can distort the results.
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As other polls show tight race, Gallup stands apart | Reuters