How Large and Long-lasting Are the Persuasive Effects of Televised Campaign Ads? Results from a Randomized Field Experiment

Alan S. Gerber, James G. Gimpel, Donald P. Green, Daron R. Shaw

American Political Science Review · 2011 · 592 citations · 46 references

Concepts

TL;DR

In a 2006 gubernatorial campaign, researchers deployed about $2 million in TV and radio ads, randomly assigning launch dates and ad volumes across markets, and tracked voter opinions with daily telephone polls of ~1,000 registered voters and a one‑month follow‑up. The experiment found that televised ads produced strong but short‑lived shifts in voting preferences, aligning more with priming theories than with online processing models.

Abstract

We report the results of the first large-scale experiment involving paid political advertising. During the opening months of a 2006 gubernatorial campaign, approximately $2 million of television and radio advertising on behalf of the incumbent candidate was deployed experimentally. In each experimental media market, the launch date and volume of television advertising were randomly assigned. In order to gauge movement in public opinion, a tracking poll conducted brief telephone interviews with approximately 1,000 registered voters each day and a brief follow-up one month after the conclusion of the television campaign. Results indicate that televised ads have strong but short-lived effects on voting preferences. The ephemeral nature of these effects is more consistent with psychological models of priming than with models of on-line processing.

References

46