Political scandals are highly relevant for political decision-making and democratic processes more generally. While most prior research employed experimental and cross-sectional survey studies, we tested the effects of a political scandal in the context of the 2017 Austrian Parliamentary Elections using panel data (N = 559, both waves). Importantly, we used a unique data set collected before and just after a major scandal broke in the final election phase. Drawing on a motivated reasoning perspective, attribution theory, and the inclusion/exclusion model, our results revealed a scandal-eroding effect particularly damaging a candidate’s own base of supporters and leaving followers in disappointment. The findings also showed a negative scandal-spillover effect for candidate supporters high in scandal knowledge decreasing political trust toward other politicians. Importantly, the results revealed that negative candidate evaluations are not a necessary precondition for negative spillover effects on political trust more generally.