Every day, at least a half-dozen threads are started here to discuss a newly released poll. More often than not (in fact, much more often than not), there will be a handful of posts that claim that the poll is bad, or that the pollster is generically unreliable or in the pocket of the Republican Party. In fact, if we were to believe this charge against every pollster that has earned it, then the following polling agencies would not be trusted:
-Rasmussen Reports
-Zogby International
-Mason Dixon Research and Polling
-Strategic Vision
-USA Today/Gallup
-Survey USA
-Quinnipiac University
Leaving us with virtually no nationally recognized pollster to "trust" on key races that we all are or should be paying attention to.
The symptoms are far worse than this, however. Whenever one of these pollsters (or a different one, it doesn't matter) publishes a poll that shows a Democrat up, its universally accepted and celebrating. Hell, people are popping open champagne bottles at the mention of a three-point lead in the Missouri Senate race. Two weeks later, the same exact pollster will conduct the same exact poll in the same exact state, and the Republican will be up by four points. Suddenly, the poll is unreliable and is being paid to shill for the GOP.
Consider the outrage when Quinnipiac University released a poll giving Joe Lieberman (DU's public enemy #1) a 17-point lead on Ned Lamont:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=102x2571775Yet, today Quinnipiac released a poll showing a virtual tie between Jim Davis and Charlie Crist in the Florida Governor's race:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=132x2902791Strangely, the people who insisted that Quinnipiac could not be trusted were no where to be found.
Recently, a spate of Mason Dixon polls were released that showed Democrats winning all key Senate races except for Tennessee and Virginia. Yet, Mason Dixon is being accused of being skewed to the right, even though they project the same 50-50 makeup in the Senate as everybody else. Consider the Mason Dixon poll released in Virginia:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=132x2902849With the Mason Dixon poll released in Missouri:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=132x2902706Oddly enough, you don't find any people complaining about Claire McCaskill having a three point lead over Jim Talent.
And I can't even count on two hands the number of times I was called a traitorous Lieberman supporter for believing every single poll that's come out that shows Lamont without a lead.
Only believing the polls that show Democrats ahead is as useful as not even looking at the polling numbers and assuming that the Democrats are winning. Polling numbers are an extremely valuable tool in determining the course of a campaign, and properly assessing the political landscape. Its a judgement on the past and an indicator of the future, and thus is invaluable in the present. You can't cherry-pick them, however, or its all meaningless. The people that stick their head in the sands and decry any poll that shows Lamont trailing are the same people who are the first to post conspiracy theories about the Lieberman victory "they never saw coming".
The greater folly of this process is that its a never-ending cycle. You don't believe poll numbers when they come out, and then you claim fraud when your candidate loses. And since you believe you lost the election because of fraud--and not the real reason of the voters supporting a different platform than the one you had to offer--then you are never challenged to move your platform to appeal to a larger base of people. And the more stagnant your positions come, the more you underperform at the polls, and the louder your calls of fraud become. And suddenly you're yelling about a Diebold conspiracy in states that don't even offer electronic voting as an option. This is the quickest route to the fringe (also known as political irrelevency) that I know of.
When using polls to look at a race, its important to look at all of the availible polling, even if you have doubts about its methodology. The difference between pollsters is often the samples they use; some oversample Republicans, while others undersample Independents, while still others use different criteria for determining who's a "likely voter". The most important thing to remember is that predictions cannot be proven wrong until Election Day. If a poll sample has 40% of Republicans, that poll is not false until less than 40% of Republicans show up at the poll on November 7th. Until then, dismissing the poll because of a percieved error in its sampling is inane.
Beyond that, even if sampling is consistently unsound, that consistency can be an important tool. For instance, Mason Dixon is accused of over-sampling Republicans. Which means that, in every poll they conduct, the amount of oversampling is roughly the same. So we can draw conclusions out of that. If they conducted a poll in late September that show Allen and Webb tied at 43%, and they released a poll today showing Allen with a four-point lead, even if those numbers are off, the trend is not. If Mason Dixon used the same methodology for each poll, then the poll still shows a four-point increase for George Allen, regardless of whether the numbers are perfectly accurate. That trending data is often more important than any given poll's numbers.
Finally, if you are going to criticize a poll, please make sure you know what you're talking about before you do it. I would bet a substantial amount of money that the credible news organizations that regularly cite polls know more about polling than you do. I would bet double the amount of money that pollsters know even more. Accusing them of a faulty methodology is like telling Albert Pujols that the mechanics of his swing are wrong.
There is only one poll that should be categorically dismissed, at least for now. John Zogby, one of the premiere pollsters in the United States, oversees two polling agencies: Zogby International and a new, innovate form of polling called Zogby Interactive. Zogby International remains one of the most trusted and reliable polling groups in the world. Zogby Interactive, however, is an experimental approach to polling that involves contacting users through email, and allowing them to be polled online. This method is not only untested, but it also has very serious flaws its surface when it comes to verification and sampling. Zogby is offering this service as a test of its effectiveness, rather than as a legitimate poll--at least for now. If Zogby can work out the kinks, interactive polling may be the way its done in the future. In the meantime, however, its numbers should not be counted at all.