Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, determining that a voting user interface (VUI) is to be provided with search results, the VUI enabling a user to submit one or more votes in a voting-based campaign; receiving social content, the social content having been distributed using one or more social networking services; receiving search results that are responsive to a search query; and transmitting instructions to display the search results and the VUI, the VUI comprising the social content.