Why the Polls Drive Us Crazy (and Shouldn't)

There was a lot of talk last week about John McCain's "momentum" -- about the Republican brand rebounding.

And a dark cloud of gloom descended over many of those hoping to bring an end to the Bush era. "We've seen this before," was a common sentiment. A reader recently sent me a story, written during the lead-up to the 2004 election, about Kerry's seemingly indomitable lead in the polls -- a lead similar to Barack Obama's 8-point (average) advantage in the horse race a few weeks ago.

Then, this week, the storm clouds parted and the sun shone down on progressive America as Obama seemingly regained his mojo. Now he has surged back into the lead!

This emotional roller coaster is bad for one's psychic health and entirely unwarranted. The bigger picture is this: For about 10 days during the past 10 months -- after Sarah Palin's introduction to the country but before Americans got a good look at her beliefs -- McCain inched ahead of Obama in the national head-to-heads. Now, the tide appears to be turning back in Obama's favor: As the electorate has gotten enough of a look at Palin to distrust her, her once-high approval numbers have taken a nosedive. And McCain continues to say brilliant things like the economy is fundamentally sound and he won't meet with the dastardly prime minister of Spain.

More to the point, the significance of those head-to-head polls -- the yardstick featured in so much political reporting -- is completely overblown. The reality is that nobody knows what's going to happen in November. It's an unprecedented election in two ways: a black man is vying to become the president of the United States; and in the midst of an economic meltdown, voters are feeling an unprecedented degree of pessimism about the direction the country is heading.

Clearly, there is reason to believe that the "Bradley effect" -- the historical fact that some of those who tell pollsters that they're ready to vote for a person of color won't -- will have an impact on the election. How big will that impact be? Nobody knows.

Just as clearly, Obama has inspired a massive groundswell of interest, particularly among younger voters. Will they vote in numbers we've never seen before? Nobody knows (many have only a cell phone, and cell phone users are rarely polled).

At the same time, we know that in times of pronounced pessimism, people tend to vote the ruling party out of office. Yet, John McCain has spent a career carefully nurturing an image of independence from his party. Will he overcome the tarnished Republican brand? Nobody knows.

Those uncertainties are what ultimately make the polls almost meaningless. Pollsters don't offer us their raw data; they weight their results in various ways -- by age, party identification, past voting records, etc., in order to make their samples conform more or less with past experience. In an election for which we essentially have no past experience, it all becomes much more art than science.

Consider how they did during the primaries. Through the first five months of this year, Zogby's polling was off by an average of almost 7 points, Fox News by 4 points and Survey USA by 4.5 points. Mason-Dixon's average error was more than 8 points, and Rasmussen was off by more than 7.

Don't get me wrong -- those national polls, taken as a whole, are a good indication of broad trends in the mood of the electorate and are not without value. But the reality is that the nationwide polls we see being released almost every day are a poor indicator of what will happen come November.

Remember that we don't vote for president in the United States -- we vote state by state for electors who vote for the president. As I write, new polls show Obama up by 9 points in Michigan, 5 points in Pennsylvania and a couple of points in Ohio -- all crucial swing states.