Separation by Television Program: Understanding the Targeting of Political Advertising in Presidential Elections

Abstract

Although conventional wisdom suggests that imbalanced message flows are relatively rare in presidential campaigns, this view relies on the assumption that competing campaigns allocate their advertising similarly. In this research, we show that this assumption is false. We combine ad tracking data from the Wisconsin Advertising Project with a unique collection of survey data on the audience for various program genres. Examining advertising in the 2000, 2004, and 2008 U.S. presidential races, we find that the Republican and Democratic candidates distributed their advertising differently across different program genres, reaching different types of voters. A form of microtargeting has increasingly entered into the realm of political advertising buys. We find that who sees certain political ads is more nonrandom than scholars had previously thought, and we find that unbalanced message flows (a precondition for ad persuasion) are more prevalent than conventional wisdom has suggested.

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