This study examined the extent to which mobilizing information (MI) was present on the websites of the largest, national U.S. labor unions during the 2012 presidential campaign. Using a content analysis, results showed that information and features associated with the election were scarce on the sites. The websites exhibited modest amounts of tactical MI associated with the presidential election. Locational and identificational MI were almost nonexistent on the sites. In addition, analyses showed that size of union was related to the number of features on the sites.