Scholars of electoral autocracies accord far more attention to post-election protests than pre-election ones, as the former have the potential to trigger a regime transition. We argue that pre-election protests can have a significant effect on election outcomes. In particular, they are likely to deepen social cleavages along two dimensions: age and immigrant status. The 2019 social unrest in Hong Kong provides a unique opportunity to evaluate the electoral impact of pre-election protests. Comparing public opinion data related to the 2019 and 2015 District Council elections, we find strong empirical support for our argument, as immigrant status and age are strong predictors of voting choices and voter turnout. Our findings imply that exposure to democratic protests may not help in bridging the gap in political attitudes between immigrants and natives.