We learned two things from Tuesday's Democratic primary in New Hampshire: First, the Hillary Clinton campaign is very much alive; second, the pre-election polls were virtually useless. According to the numbers, Barack Obama was on pace to win by a margin of five to 13 percentage points; instead, he lost by three.
But opinion polling might be much worse than inaccurate. It's easy to imagine that the polls themselves affect the outcome of the elections they're supposed to predict. Voters may be inclined to jump on the bandwagon of a candidate who appears to be cruising to victory. Or they may stay home if they think their favorite is either out of the running or coasting to an easy win. Many believe that ubiquitous horse-race coverage pushes second-tier candidates out of the picture—and that Joseph Biden, Chris Dodd, Bill Richardson, and Ron Paul are all suffering at the hands of meddlesome pollsters.
Is it true that we'd be better off without polls? What would happen if pre-election polls were banned altogether? Let's conduct a thought experiment to find out.
Our counter-factual may seem prima facie ridiculous, since any attempt to ban media organizations from presenting opinion polls would run afoul of the First Amendment. But the idea doesn't seem so far-fetched when you consider similar policies that have been implemented in democracies around the world. According to a survey conducted in 1997, 39 of 78 countries had some kind of rule against pre-election polling. In the Philippines, the government briefly banned election surveys in the 15 days leading up to a national election. India's Election Commission banned the broadcast of opinion polls for two weeks in 1998. Starting in 1977, France had a two-week embargo on opinion poll results, which was later reduced to two days. Even our neighbors to the north imposed a three-day embargo in the mid-1990s. (The rule was later overturned by Canada's Supreme Court.)
For our purposes, let's assume a ban that applies to releasing poll results, as opposed to conducting polls. Using the abandoned Canadian law as a guide, we'll imagine a situation in which it's illegal to "broadcast, publish, or disseminate the results of an opinion survey respecting how electors will vote in an election." We'll also assume that the embargo lasts for the entire election season, instead of just the 48 or 72 hours leading up to Election Day.
First of all, the numbers would leak out anyway. We know that the Canadian embargo was violated by Internet activists who published survey results via U.S. servers. In our experiment, we'd expect to see major media outlets holding to the gag rule, while bloggers provided a steady diet of rumors and reports about the latest numbers. Savvy campaign strategists might try to feed false or self-serving information into the blogosphere, but true political junkies could consult mainstream media sources based overseas. (In short, only highly motivated voters with Internet access would keep abreast of the polling data.)
Without polling numbers to drive their narrative, political journalists would turn to other, less direct measures of candidate strength. At the outset of campaign season, the front-runners would be designated according to the size of their war chests, and the number of endorsements each had racked up. Focus groups, man-on-the-street interviews, and even voter brain scans would get more media play. Political futures markets might become a central element of mainstream campaign coverage, rather than the fringe oddity they are today.
Reporters might pay more attention to the turnout at campaign events, totting up average attendance figures and reporting them as rough guides to candidate popularity. As a result, campaign operatives would have an incentive to attract the biggest crowds they possibly could—and to hire extras to fill seats.
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