Grabbing the last seat on the bandwagon
Wednesday, November 5th, 2008 byPoll analyst extraordinaire Nate Silver wrote on Monday:
It’s amazing how much convergence there has been in the national numbers over the past 24 hours. . . . Has the race settled down some?
Perhaps in some proverbial sense it has. But I also think that pollsters peek at one another’s results, and that there’s something of a herd mentality not to be the one who falls out of line. Remember, folks, it’s these final sets of national numbers that will go down on the record for all time’s sake. Remember also that a pollster has a lot of legitimate wiggle room for how they put their turnout models together. I’m not accusing anyone of anything in particular, but this is the time of year when a lot of pollsters might be tempted to put their fingers on the scale.
In case you’re wondering who Nate was pretending not to talk about, the TIPP poll sponsored by Investor’s Business Daily (an even further right-wing imitator of the Wall Street Journal) showed Barack Obama leading John McCain by a mere 2 points on Sunday, leading to much fantasizing among Republicans about a McCain comeback.
With the actual election closing in on Monday, though, the TIPP/IBD poll suddenly shifted aggressively toward Obama, who soared to a 7-point lead on the strength of its final-day sample and a lopsided “allocation” of undecided voters (2 to 1 in favor of Obama). The final result brought TIPP into line with all of the other major pollsters, and thus was not embarrassingly far off from Tuesday’s actual voting. Convenient, eh?
Kudos, by the way, to Silver for projecting the final popular vote within a tenth of a percentage point (52.3% Obama to 46.2% McCain, versus 52.4% to 46.3% in the not-quite-final tallies), and the Pew Research Center, which projected a 52-46 result two days in advance based on its (apparently more scientific) allocation of undecided voters.

If you’re the kind of political junkie who reads progressive blogs even in the dog days of summer, there’s a good chance you’ve spent the last couple of weeks agonizing over John McCain’s shamelessly dishonest attacks on Barack Obama and searching for meaning in the flimsiest movements of poll data. If so, the latest poll from 