This article explores the negative campaign messages made by presidential nomination candidates on their opponents. Using a compilation of national and state media accounts of candidate attack activity from the 1992 Democratic nomination race, we seek to answer the questions --are the intermediated attacks made by presidential nomination candidates random events or are they predictable consequences of measurable variables ? Moreover, when candidates attack, who is their likely target? We find that intermediated candidate attacks can be predicted based on a number of conditions. Among these conditions are competitive positioning, reward factors and media-related conditions. Moreover, the general foci of attacks appear to be limited to attacking those who are competitively in the top tier. Attacks vary both in their frequency and in their nature depending on the competitive stage of the campaign. The systematic evaluation of these opponent-focused negative messages and their role in candidate strategy and voter evaluation is important for understanding presidential nomination politics and strategic communication in elections in general.