On Monday, the American Research Group released a very surprising new poll out of Iowa, which has caused quite a stir in the political world this week. The ARG results showed the Democratic presidential race shaping up this way:
Clinton 34% (last week 29%)
Edwards 20% (last week 18%)
Obama 19% (last week 25%)
Biden 8% (last week 8%)
The numbers for Republicans were also quirky, with John McCain doing far better than in other Iowa polls (he was third with 17%), and Fred Thompson doing far worse (a distant sixth with 3%).
But it was those Democratic results that really raised eyebrows. Some recent polls out of Iowa show Obama inching ahead of the field, though all of the top three candidates are within a few points of one another. And yet, ARG showed Clinton surging ahead with a whopping 15-point lead over Obama.
The results were released on Christmas Eve, which is generally a slow news day, but the ARG poll nevertheless drew some attention. CNN cited the data to argue that Clinton “appears to be breaking away from the pack.” Drudge gave the poll quite a bit of play yesterday, so politicos who might have missed it over the holiday quickly caught up with the news.
At first blush, I thought the poll might just be an outlier to be taken with a grain of salt, pending additional post-Christmas results. As it turns out, while the ARG poll is certainly dubious, there’s more to it than that.
The problem has to do with who pollsters can find via phone around the holidays. Pollster.com’s Mark Blumenthal noted that, historically, polling outlets didn’t even try to do surveys between Christmas and the New Year (indeed, Blumenthal said, “All of the polling firms I worked with rarely fielded surveys in the second half of December and typically shut down altogether between Christmas and New Years.”)
Of course, that was before the absurd race between early-voting states became comical, and the all-important Iowa caucuses were moved up to Jan. 3. Because the contest will have sweeping influence on who wins the parties’ nominations (whether it should or not), everyone is looking for polling data. As a result, pollsters have surveys in the field, even though it’s very difficult to get a balanced, representative sample.
And who are pollsters missing?
Three years ago, in a survey concluded a full week before the holidays (12/15-17/2004), the Gallup Organization asked a national sample of 1,002 adults whether they planned “to travel more than fifty miles from home this holiday season.” Twenty-eight percent (28%) said “yes.” More important, as the table below indicates (based on data drawn from the Roper Archives), those planning holiday travel had a very distinctive demographic profile. Holiday travelers were much more likely to be younger and better educated. Notice also that holiday travelers were not just college students. Adults between the ages of 30 and 44 are twice as likely to travel for the holidays than those over 65. […]
All of this brings us to the survey that the American Research Group released on Monday fielded between Thursday December 20 through Sunday December 23, a survey that shows Clinton gaining and Obama falling. Some will read this post as an attempt to debunk that result, and the findings above certainly argue for considerable caution in reading results from any survey this week. But the problem in trying to assess the ARG poll is that we know so little about it. Does ARG make call-backs to unavailable respondents? What was the sample composition on any ARG Iowa survey this year in terms of age and education level, and was this one suddenly different? Did ARG weight the results by age or education this time, and if so, by how much? We are in the dark on all of these questions.
It is also worth remembering, as some commenters noted yesterday, that real changes may be occurring in vote preference this week even if surveys may be severely challenged in their ability to measure it. Clinton may be gaining and Obama falling. So it is quite a leap for anyone to say they know conclusively that the ARG result is either right or wrong.
The same is probably true of almost any poll conducted this week. In other words, when it comes to poll results over the next week, caveat emptor.