Dark necessities? Candidates’ aversive personality traits and negative campaigning in the 2018 American Midterms

Are candidates with “dark” personality profiles more likely to go negative? We triangulate data for the 2018 Senate Midterms in the United States from two independent sources (the automated coding of social media posts and an expert survey) and test the extent to which the candidates’ “dark” personality traits (narcissism, psychopathy, and Machiavellianism) are associated with their negativity and incivility. By and large, we find that this is the case, especially when combining the separate traits into broader indicators of “dark” personality (“dark core” and underlying personality dimensions). These results resist robustness checks via models run with alternative specifications, such as using measures of personality (and campaign) that are adjusted to filter out the ideological profile of experts, additional covariates, more restrictive modelling, and alternative measurement of key dependent variables.